oneblackcrayon/00_wp-optimizations-n-cleanup.md

## 00_wp-optimizations-n-cleanup.md

      
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              00_wp-optimizations-n-cleanup.md
            
          
    ** WP - Optimizations and Cleanup **
Here you can find a a list of WP optimization and cleanup functions and methodology.

.htaccess


Force https to your site.
Enable Browser Cache for your static files. This will fix the "Leverage Browser Caching" in the google pagespeed results.
Enable file compreassion for faster page load.


wp-config.php


Example of how to enable wp-debug and log the errors, during development.
Limit posts revisions, in order to have smaller DB.
Change the update method. /!\  This is usefull usually when bringing a site from server to localhost.


functions.php


Organize your functions.php by including your custom files for better readability. You can seperate you custom files,
by responsibility, by back/frond end, by what they modify (e.g. woocommerce mods).


cds-wp-admin-tweaks-n-extras.php


Example custom function to add an extra column to the admin area of the posts list.


cds-optimizations-n-tweaks.php

-- Example custom functions for optimizing WP and removing tags for security

Clean wp_head. Remove unnecessary links, scripts and the_generator (the wp one) from .
Remove WPML generator.
Remove Slider Revolution generator.
Remove Visual Composer / WPBakery Page Builder generator.
Remove comment-reply.min.js completely.
Remove jQuery Migrate Script from header and Load jQuery from Google API.
Remove Yoast SEO comments.
Remove Query Strings (the version) from script and style files,
some files won't be cached if there is a query string in them. /!\ may produce errors! check carefully!
remove wp version param from any enqueued scripts (using wp_enqueue_script()) or styles (using wp_enqueue_style()).


## 01_.htaccess
# ##################################
# 	       SECURITY
# ##################################

# Disable the server signature
ServerSignature Off

# Add default charset
AddDefaultCharset UTF-8

# Disable directory browsing
Options All -Indexes

# Redirect all trafic to https
<IfModule mod_rewrite.c>
RewriteEngine On

# Redirect http to https
# RewriteEngine On
# RewriteCond %{HTTPS} !=on
# RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]

# Redirect www to non-www and http to https
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
RewriteRule ^ https://%1%{REQUEST_URI} [L,NE,R=301]

# Redirect non-www to www and http to https
# RewriteCond %{HTTP_HOST} !^www\. [NC,OR]
# RewriteCond %{HTTPS} off
# RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
# RewriteRule ^ https://www.%1%{REQUEST_URI} [R=301,L,NE]
</IfModule>

# Protect System Files, Disable PHP in Uploads, Filter Request Methods, by iThemes Security
<IfModule mod_rewrite.c>
	RewriteEngine On

	# Protect System Files
	RewriteRule ^wp-admin/install\.php$ - [F]
	RewriteRule ^wp-admin/includes/ - [F]
	RewriteRule !^wp-includes/ - [S=3]
	RewriteRule ^wp-includes/[^/]+\.php$ - [F]
	RewriteRule ^wp-includes/js/tinymce/langs/.+\.php - [F]
	RewriteRule ^wp-includes/theme-compat/ - [F]
	RewriteCond %{REQUEST_FILENAME} -f
	RewriteRule (^|.*/)\.(git|svn)/.* - [F]

	# Disable PHP in Uploads
	RewriteRule ^wp\-content/uploads/.*\.(?:php[1-7]?|pht|phtml?|phps)\.?$ - [NC,F]

	# Filter Request Methods
	RewriteCond %{REQUEST_METHOD} ^(TRACE|TRACK) [NC]
	RewriteRule ^.* - [F]
</IfModule>

# Secure Important Files
<FilesMatch "^.*(error_log|wp-config\.php|\.ini|\.[hH][tT][aApP].*)$">
Order deny,allow
Deny from all
</FilesMatch>

## Prevent access to specific types of files
#<FilesMatch "\.(htaccess|htpasswd|ini|phps|fla|psd|log|sh)$">
#    Order Allow,Deny
#    Deny from all
#</FilesMatch>

# Protect System Files
<files .htaccess>
	Order allow,deny
	Deny from all
</files>
<files readme.html>
	Order allow,deny
	Deny from all
</files>
<files readme.txt>
	Order allow,deny
	Deny from all
</files>
<files wp-config.php>
	Order allow,deny
	Deny from all
</files>

# Block WordPress xmlrpc.php requests
<Files xmlrpc.php>
order deny,allow
deny from all
</Files>

# Security Headers
# May cause errors, usually when loading external scripts, iframes etc..
<IfModule mod_headers.c>
	# Use HTTP Strict Transport Security to force client to use secure connections only.
	# max-age=15768000 is 6 Months
	Header always set Strict-Transport-Security "max-age=15768000; includeSubDomains; preload"

	# Enforce enable the cross-site scripting (XSS) filter built into modern web browsers.
	Header set X-XSS-Protection "1; mode=block"

	# Provide clickjacking protection by not allowing iframes to load our website.
	header always set x-frame-options "SAMEORIGIN"

	# Prevent IE and Chrome from sniffing a response away from the declared content-type. This helps reduce the danger of drive-by downloads and helps treat the content the right way.
	Header always set x-content-type-options "nosniff"

	# Activate CORS
    <FilesMatch "\.(ttf|ttc|otf|eot|woff|woff2|font.css|css|js|gif|png|jpe?g|svg|svgz|ico|webp)$">
        Header set Access-Control-Allow-Origin "*"
    </FilesMatch>

    # Set Content security policy as to:
    # default-src 	  - Is the default policy for loading content such as JS, Images, CSS, Fonts etc..
    # https:  		  - Allows loading resources only over HTTPS on any domain.
    # data:  		  - Allows loading resources via the data scheme (eg Base64 encoded images).
    # 'unsafe-inline' - allow inline css,js
    # 'unsafe-eval'   - Allows unsafe dynamic code evaluation such as JavaScript eval()
    # More info: https://content-security-policy.com/
    Header always set Content-Security-Policy "default-src https: data: 'unsafe-inline' 'unsafe-eval'"

    # Set the Referrer-Policy
    # no-referrer-when-downgrade - The origin, path, and querystring of the URL are sent as a referrer when
    # 							   the protocol security level stays the same or improves,
    #							   but isn't sent to less secure destinations.
    Header set Referrer-Policy "no-referrer-when-downgrade"

    # Set the Feature-policy
	Header set Feature-Policy "vibrate 'self'; push *; camera 'none'; microphone 'none'"
</IfModule>

# ##################################
# 	     PERFORMANCE
# ##################################

# cds - BEGIN DEFLATE COMPRESSION
<IfModule mod_deflate.c>
    # Compress HTML, CSS, JavaScript, Text, XML and fonts
	<IfModule mod_filter.c>
        FilterDeclare COMPRESS
        FilterProvider COMPRESS DEFLATE resp=Content-Type $text/css
        FilterProvider COMPRESS DEFLATE resp=Content-Type $text/html
	 	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/javascript
        FilterProvider COMPRESS DEFLATE resp=Content-Type $text/plain
        FilterProvider COMPRESS DEFLATE resp=Content-Type $text/xml
	 	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/javascript

        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/json
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-javascript
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/atom+xml
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/rss+xml
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xhtml+xml
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xml

        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/vnd.ms-fontobject
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-ttf
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-opentype
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-otf
        FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-truetype
        FilterProvider COMPRESS DEFLATE resp=Content-Type $font/opentype

        FilterProvider COMPRESS DEFLATE resp=Content-Type $image/svg+xml
        FilterProvider COMPRESS DEFLATE resp=Content-Type $image/x-icon

        FilterChain COMPRESS
	 	FilterProtocol COMPRESS DEFLATE change=yes;byteranges=no
    </IfModule>
    <IfModule !mod_filter.c>
        # Compress HTML, CSS, JavaScript, Text, XML and fonts
        AddOutputFilterByType DEFLATE application/javascript
        AddOutputFilterByType DEFLATE application/rss+xml
        AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
        AddOutputFilterByType DEFLATE application/x-font
        AddOutputFilterByType DEFLATE application/x-font-opentype
        AddOutputFilterByType DEFLATE application/x-font-otf
        AddOutputFilterByType DEFLATE application/x-font-truetype
        AddOutputFilterByType DEFLATE application/x-font-ttf
        AddOutputFilterByType DEFLATE application/x-javascript
        AddOutputFilterByType DEFLATE application/xhtml+xml
        AddOutputFilterByType DEFLATE application/xml
        AddOutputFilterByType DEFLATE font/opentype
        AddOutputFilterByType DEFLATE font/otf
        AddOutputFilterByType DEFLATE font/ttf
        AddOutputFilterByType DEFLATE image/svg+xml
        AddOutputFilterByType DEFLATE image/x-icon
        AddOutputFilterByType DEFLATE text/css
        AddOutputFilterByType DEFLATE text/html
        AddOutputFilterByType DEFLATE text/javascript
        AddOutputFilterByType DEFLATE text/plain
        AddOutputFilterByType DEFLATE text/xml
    </IfModule>
    # Remove browser bugs (only needed for really old browsers)
    <IfModule mod_setenvif.c>
        BrowserMatch ^Mozilla/4 gzip-only-text/html
	 	BrowserMatch ^Mozilla/4\.0[678] no-gzip
	 	BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
	 	SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
    </IfModule>
    <IfModule mod_headers.c>
        Header append Vary User-Agent env=!dont-vary
	 	Header append Vary Accept-Encoding
    </IfModule>
</IfModule>
# cds - END DEFLATE COMPRESSION

# cds - START EXPIRES CACHING - Optimizing cache-control #
<IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault "access plus 1 month"
    ExpiresByType text/html "access plus 1 seconds"
    ExpiresByType text/xml "access plus 1 seconds"
    ExpiresByType text/plain "access plus 1 seconds"
    ExpiresByType application/xml "access plus 1 seconds"
    ExpiresByType application/rss+xml "access plus 1 seconds"
    ExpiresByType application/json "access plus 1 seconds"
    ExpiresByType text/css "access plus 1 month"
    ExpiresByType text/javascript "access plus 1 month"
	ExpiresByType application/javascript "access plus 1 month"
	ExpiresByType application/x-javascript "access plus 1 month"
	ExpiresByType image/x-ico "access plus 1 year"
	ExpiresByType image/x-icon "access plus 1 year"
	ExpiresByType image/gif "access plus 1 year"
	ExpiresByType image/png "access plus 1 year"
	ExpiresByType image/jpe "access plus 1 year"
	ExpiresByType image/jpg "access plus 1 year"
	ExpiresByType image/jpeg "access plus 1 year"
	ExpiresByType video/ogg "access plus 1 month"
	ExpiresByType audio/ogg "access plus 1 month"
    ExpiresByType video/mp4 "access plus 1 month"
    ExpiresByType video/webm "access plus 1 month"
    ExpiresByType font/truetype "access plus 1 month"
    ExpiresByType font/opentype "access plus 1 month"
    ExpiresByType application/x-font-woff "access plus 1 month"
	ExpiresByType image/svg+xml "access plus 1 year"
    ExpiresByType application/pdf "access plus 1 month"
	ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
	<IfModule mod_mime.c>
	 	AddType image/vnd.microsoft.icon .ico
        ExpiresByType image/vnd.microsoft.icon "access plus 1 year"
    </IfModule>
    <IfModule mod_headers.c>
		#  Turn ETags Off
        Header unset ETag
	 	Header unset Pragma
	 	Header unset Last-Modified
		Header set Connection keep-alive
        Header append Cache-Control "public, no-transform, must-revalidate"
    </IfModule>
</IfModule>
# cds - END EXPIRES CACHING - Optimizing cache-control #

## cds - BEGIN Cache-Control Headers
#<ifModule mod_headers.c>
#<filesMatch "\.(ico|jpeg|jpg|png|gif|swf|pdf|svg)$">
#Header set Cache-Control "public"
#</filesMatch>
#<filesMatch "\.(css)$">
#Header set Cache-Control "public"
#</filesMatch>
#<filesMatch "\.(js)$">
#Header set Cache-Control "private"
#</filesMatch>
#<filesMatch "\.(x?html?|php)$">
#Header set Cache-Control "private, must-revalidate"
#</filesMatch>
#</ifModule>
## cds - END Cache-Control Headers

# Now that we're sending far-future expires headers (previous step),
# we can disable all ETags that otherwise would have been sent by the server
# From: https://htaccessbook.com/disable-etags/
FileETag none

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
# END WordPress

## 01_b_wp-content_uploads_.htaccess
# Block PHP Files in Uploads Directory
<FilesMatch "\.(?i:php)$">
  <IfModule !mod_authz_core.c>
    Order allow,deny
    Deny from all
  </IfModule>
  <IfModule mod_authz_core.c>
    Require all denied
  </IfModule>
</FilesMatch>

## 02_wp-config.php
<?php
// WP memory settings
// define('WP_MEMORY_LIMIT', '256M');

// Enable debug log in wp-content/debug.log
define('WP_DEBUG', false);
define('WP_DEBUG_LOG', false);
define('WP_DEBUG_DISPLAY', false);

// Limit revisions to 3
define('WP_POST_REVISIONS', 3);

// OR
// Disable revisions
// define('WP_POST_REVISIONS', false);

// Require SSL for Admin and Logins
define( 'FORCE_SSL_ADMIN', true );

// Disable the Plugin and Theme Editor
define( 'DISALLOW_FILE_EDIT', true );

// Block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true and this will only allow localhost and your blog to make requests
define( 'WP_HTTP_BLOCK_EXTERNAL', true );
// define( 'WP_ACCESSIBLE_HOSTS', 'api.wordpress.org,*.github.com' ); //comma separated list of hostnames to allow, wildcard domains are supported

// Solve problem of wordpress asking for ftp
// when updating plugins in localhost
// define('FS_METHOD','direct');

## 03_functions.php
<?php

/************************************************************************
 * load Optimization file, which has various
 * functions to improve pagespeed of the site
 * and cleanup WP
 ***********************************************************************/
include( get_stylesheet_directory() . './cds-optimizations-n-tweaks.php' );

/************************************************************************
 * load cds-wp-admin-tweaks-n-extras file, which has various
 * functions to make changes/additions to the WP admin area
 ***********************************************************************/
include( get_stylesheet_directory() . './cds-wp-admin-tweaks-n-extras.php' );

## 04_cds-optimizations-n-tweaks.php
<?php
/**
 * CubeDesigns - Wordpress Optimizations and Tweaks
 *
 * Some of the below function are from the Plugin: Meta Generator and Version Info Remover
 * (https://wordpress.org/plugins/meta-generator-and-version-info-remover/)
 */


/************************************************************************
 * Header items cleaning.
 *
 * @return void
 ***********************************************************************/
function cds_clean_the_header_outout() {
    remove_action( 'wp_head', 'wp_generator' ); // Remove WP Generator Vesion.
    remove_action( 'wp_head', 'wp_resource_hints', 2 ); // Remove s.w.org DNS-Prefetch.
    remove_action( 'wp_head', 'wlwmanifest_link' ); // Remove wlwmanifest.xml.
    remove_action( 'wp_head', 'rsd_link' ); // Remove Really Simple Discovery Link.
    remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 ); // Remove Shortlink URL.
    remove_action( 'wp_head', 'print_emoji_detection_script', 7 ); // Remove Emoji's Styles and Scripts.
    remove_action( 'wp_print_styles', 'print_emoji_styles' ); // Remove Emoji's Styles and Scripts.
    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' ); // Remove Emoji's Styles and Scripts from Admin.
    remove_action( 'admin_print_styles', 'print_emoji_styles' ); // Remove Emoji's Styles and Scripts from Admin.
    remove_action( 'wp_head', 'index_rel_link' ); // Remove Link to Home Page.
    remove_action( 'wp_head', 'feed_links_extra', 3 ); // Remove Every Extra Links to RSS Feeds.
    remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 ); // Remove Prev-Next Links from Header - Not from Post.
    remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 ); // Remove Prev-Next Links.
    remove_action( 'wp_head', 'start_post_rel_link', 10, 0 ); // Remove Random Link Post.
    remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 ); // Remove parent Post Link.

    add_filter( 'the_generator', '__return_false' ); // Remove Generator Name from RSS Feed.
}
add_action( 'after_setup_theme', 'cds_clean_the_header_outout' );


/************************************************************************
 * Remove WPML generator
 ***********************************************************************/
if ( !empty ( $GLOBALS['sitepress'] ) ) {
    function cds_remove_wpml_generator() {
        remove_action(
            current_filter(),
            array ( $GLOBALS['sitepress'], 'meta_generator_tag' )
        );
    }
    add_action( 'wp_head', 'cds_remove_wpml_generator', 0 );
}


/************************************************************************
 * Remove Slider Revolution generator
 ***********************************************************************/
function cds_remove_revslider_meta_tag() {
    return '';
}
add_filter( 'revslider_meta_generator', 'cds_remove_revslider_meta_tag' );


/************************************************************************
 * Remove Visual Composer / WPBakery Page Builder generator
 ***********************************************************************/
function cds_remove_visual_composer_generator() {
    if ( class_exists( 'Vc_Manager' ) || class_exists( 'Vc_Base' ) ) {
        remove_action('wp_head', array(visual_composer(), 'addMetaData'));
    }
}
add_action('init', 'cds_remove_visual_composer_generator', 100);


/************************************************************************
 * Remove comment-reply.min.js completely
 ***********************************************************************/
function cds_remove_comment_reply_js() {
	wp_deregister_script( 'comment-reply' );
}
add_action('init', 'cds_remove_comment_reply_js', 10);


/************************************************************************
 * Remove jQuery Migrate Script from header
 * and Load jQuery from Google API
 ***********************************************************************/
function cds_remove_jquery_migrate_load_google_hosted_jquery(){
	if (!is_admin()) {
		wp_deregister_script('jquery');
		wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js', false, null);
		wp_enqueue_script('jquery');
	}
}
add_action('init','cds_remove_jquery_migrate_load_google_hosted_jquery');


/************************************************************************
 * Remove Yoast SEO comments
 ***********************************************************************/
function cbs_remove_yoast_seo_comments() {
    if ( ! class_exists( 'WPSEO_Frontend' ) ) {
        return;
    }
    $instance = WPSEO_Frontend::get_instance();
    // To ensure that future version of the plugin does not cause any problem
    if ( ! method_exists( $instance, 'debug_mark') ) {
        return;
    }
    remove_action( 'wpseo_head', array( $instance, 'debug_mark' ), 2 );
}
add_action('template_redirect', 'cbs_remove_yoast_seo_comments', 9999);

add_filter('wpseo_debug_markers', '__return_false', 9999); // Requires Yoast > v14.0

/************************************************************************
 * Remove Query Strings (the version) from script and style files,
 * some files won't be cached if there is a query string in them
 ***********************************************************************/
// function cds_remove_script_version( $src ){
//     $parts = explode( '?ver', $src );
//     return $parts[0];
// }
// add_filter( 'script_loader_src', 'cds_remove_script_version', 15, 1 );
// add_filter( 'style_loader_src', 'cds_remove_script_version', 15, 1 );


/************************************************************************
 * remove wp version param from any enqueued scripts
 * (using wp_enqueue_script()) or styles (using wp_enqueue_style()).
 ***********************************************************************/
function cds_remove_appended_version_script_style( $target_url ) {
    $filename_arr = explode('?', basename($target_url));
    $filename = $filename_arr[0];

    /* check if "ver=" argument exists in the url or not */
    if (strpos( $target_url, 'ver=' )) {
        $target_url = remove_query_arg( 'ver', $target_url );
    }
    /* check if "version=" argument exists in the url or not */
    if (strpos( $target_url, 'version=' )) {
        $target_url = remove_query_arg( 'version', $target_url );
    }
    return $target_url;
}
/**
 * Priority set to 20000. Higher numbers correspond with later execution.
 * Hook into the style loader and remove the version information.
 */
add_filter('style_loader_src', 'cds_remove_appended_version_script_style', 20000);
/**
 * Hook into the script loader and remove the version information.
 */
add_filter('script_loader_src', 'cds_remove_appended_version_script_style', 20000);

## 05_cds-wp-admin-tweaks-n-extras.php
<?php
/**
 * CubeDesigns - Wordpress Admin Tweaks and Extras
 *
 */


/************************************************************************
 * Add and Display featured image column in Posts list
 ***********************************************************************/
function cds_add_featured_image_column( $columns ) {
    $columns['featured_image_thumb'] = 'Featured Image';
    return $columns;
}
add_filter('manage_posts_columns' , 'cds_add_featured_image_column', 5);

function cds_display_featured_image_column_data( $column, $post_id ) {
    switch ( $column ) {
        case 'featured_image_thumb':
            echo get_the_post_thumbnail($post_id, 'thumbnail');
            break;
    }
}
add_action( 'manage_posts_custom_column' , 'cds_display_featured_image_column_data', 5, 2 );

## 06_clean_wp_expired_sessions.php
if ( current_user_can( 'manage_options' ) && get_current_user_id() == 2 ) {
    global $wpdb;

    //  Get expired wp_sessions *use LIMIT if you have a LOT of wp_sessions
    $expiration_keys = $wpdb->get_results( "
        SELECT option_name, option_value
        FROM $wpdb->options
        WHERE option_name LIKE '_wp_session_expires_%'
        AND option_value < NOW()
        LIMIT 0, 50000
    " );

	$now = time(); // EPOCH time
	$expired_sessions = array();

	foreach( $expiration_keys as $expiration ) {
		// Double check that the session has expired
		if ( $now > intval( $expiration->option_value ) ) {
			// Get the session ID by parsing the option_name
			$session_id = str_replace("_wp_session_expires_", "", $expiration->option_name);

			$expired_sessions[] = $expiration->option_name;
			$expired_sessions[] = "_wp_session_$session_id";
		}
	}

	// Delete all expired sessions in a single query
	if ( ! empty( $expired_sessions ) ) {
		$option_names = implode( "','", $expired_sessions );
    // highlight_string("<?php\n\$option_names =\n" . var_export($option_names) . ";\n");
		$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name IN ('$option_names')" );

	}

}

## 07_varius_extra_functions.php
<?php
/**
 * CubeDesigns - Varius functions for specific cases
 *
 */


/**
 * [cds_clean_attached_image_attrs]
 *
 * Remove srcset and sizes in specific page
 *
 * @param  [type] $attr       [description]
 * @param  [type] $attachment [description]
 * @param  [type] $size       [description]
 * @return [type]             [description]
 */
function cds_clean_attached_image_attrs( $attr, $attachment, $size ) {
	// Limit to specific page. e.g. posts grid page with lots of images
    // If page is: #some_page_id
	if ( is_page(137) ) {
	    // highlight_string("<?php\n\$attr =\n" . var_export($attr, true) . ";\n");
        // Remove srcset and sizes
        if ( isset($attr["srcset"]) ) { unset($attr["srcset"]); }
        if ( isset($attr["sizes"]) ) { unset($attr["sizes"]); }
    }
    return $attr;
}
add_filter( 'wp_get_attachment_image_attributes', 'cds_clean_attached_image_attrs', 10, 3 );


/**
 * [cds_disable_wp_responsive_images]
 *
 * disable srcset on frontend
 *
 * @return [type] [description]
 */
function cds_disable_wp_responsive_images() {
	return 1;
}
add_filter('max_srcset_image_width', 'cds_disable_wp_responsive_images');


/**
 * [cds_style_loader_tag_filter]
 * Add display=swap to google fonts, when not having access to the creation enque style
 *
 * @return the modified <link> tag
 */
add_filter('style_loader_tag', 'cds_style_loader_tag_filter', 10, 2);
function cds_style_loader_tag_filter($html, $handle) {
    // add &display=swap in google fonts Roboto
    if ($handle === 'Roboto') {
        if ( function_exists('simplexml_load_file') ) {
            $xmlFromHtml = simplexml_load_string($html);
            $hrefs = $xmlFromHtml->xpath("//@href");

            if (isset($hrefs) && !empty($hrefs) && is_array($hrefs)) {
                foreach($hrefs as $href) {
                    $modified_href = (string)$href . '&display=swap';
                    $final_link = "<link rel='stylesheet' id='Roboto-css' href='" . $modified_href . "' type='text/css' media='all' />";
                    $html = $final_link;
                    break;
                }
            }
        }
    }
    return $html;
}
	# ##################################
	# SECURITY
	# ##################################

	# Disable the server signature
	ServerSignature Off

	# Add default charset
	AddDefaultCharset UTF-8

	# Disable directory browsing
	Options All -Indexes

	# Redirect all trafic to https
	<IfModule mod_rewrite.c>
	RewriteEngine On

	# Redirect http to https
	# RewriteEngine On
	# RewriteCond %{HTTPS} !=on
	# RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301,NE]

	# Redirect www to non-www and http to https
	RewriteCond %{HTTPS} off [OR]
	RewriteCond %{HTTP_HOST} ^www\. [NC]
	RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
	RewriteRule ^ https://%1%{REQUEST_URI} [L,NE,R=301]

	# Redirect non-www to www and http to https
	# RewriteCond %{HTTP_HOST} !^www\. [NC,OR]
	# RewriteCond %{HTTPS} off
	# RewriteCond %{HTTP_HOST} ^(?:www\.)?(.+)$ [NC]
	# RewriteRule ^ https://www.%1%{REQUEST_URI} [R=301,L,NE]
	</IfModule>

	# Protect System Files, Disable PHP in Uploads, Filter Request Methods, by iThemes Security
	<IfModule mod_rewrite.c>
	RewriteEngine On

	# Protect System Files
	RewriteRule ^wp-admin/install\.php$ - [F]
	RewriteRule ^wp-admin/includes/ - [F]
	RewriteRule !^wp-includes/ - [S=3]
	RewriteRule ^wp-includes/[^/]+\.php$ - [F]
	RewriteRule ^wp-includes/js/tinymce/langs/.+\.php - [F]
	RewriteRule ^wp-includes/theme-compat/ - [F]
	RewriteCond %{REQUEST_FILENAME} -f
	RewriteRule (^\|./)\.(git\|svn)/. - [F]

	# Disable PHP in Uploads
	RewriteRule ^wp\-content/uploads/.*\.(?:php[1-7]?\|pht\|phtml?\|phps)\.?$ - [NC,F]

	# Filter Request Methods
	RewriteCond %{REQUEST_METHOD} ^(TRACE\|TRACK) [NC]
	RewriteRule ^.* - [F]
	</IfModule>

	# Secure Important Files
	<FilesMatch "^.(error_log\|wp-config\.php\|\.ini\|\.[hH][tT][aApP].)$">
	Order deny,allow
	Deny from all
	</FilesMatch>

	## Prevent access to specific types of files
	#<FilesMatch "\.(htaccess\|htpasswd\|ini\|phps\|fla\|psd\|log\|sh)$">
	# Order Allow,Deny
	# Deny from all
	#</FilesMatch>

	# Protect System Files
	<files .htaccess>
	Order allow,deny
	Deny from all
	</files>
	<files readme.html>
	Order allow,deny
	Deny from all
	</files>
	<files readme.txt>
	Order allow,deny
	Deny from all
	</files>
	<files wp-config.php>
	Order allow,deny
	Deny from all
	</files>

	# Block WordPress xmlrpc.php requests
	<Files xmlrpc.php>
	order deny,allow
	deny from all
	</Files>

	# Security Headers
	# May cause errors, usually when loading external scripts, iframes etc..
	<IfModule mod_headers.c>
	# Use HTTP Strict Transport Security to force client to use secure connections only.
	# max-age=15768000 is 6 Months
	Header always set Strict-Transport-Security "max-age=15768000; includeSubDomains; preload"

	# Enforce enable the cross-site scripting (XSS) filter built into modern web browsers.
	Header set X-XSS-Protection "1; mode=block"

	# Provide clickjacking protection by not allowing iframes to load our website.
	header always set x-frame-options "SAMEORIGIN"

	# Prevent IE and Chrome from sniffing a response away from the declared content-type. This helps reduce the danger of drive-by downloads and helps treat the content the right way.
	Header always set x-content-type-options "nosniff"

	# Activate CORS
	<FilesMatch "\.(ttf\|ttc\|otf\|eot\|woff\|woff2\|font.css\|css\|js\|gif\|png\|jpe?g\|svg\|svgz\|ico\|webp)$">
	Header set Access-Control-Allow-Origin "*"
	</FilesMatch>

	# Set Content security policy as to:
	# default-src - Is the default policy for loading content such as JS, Images, CSS, Fonts etc..
	# https: - Allows loading resources only over HTTPS on any domain.
	# data: - Allows loading resources via the data scheme (eg Base64 encoded images).
	# 'unsafe-inline' - allow inline css,js
	# 'unsafe-eval' - Allows unsafe dynamic code evaluation such as JavaScript eval()
	# More info: https://content-security-policy.com/
	Header always set Content-Security-Policy "default-src https: data: 'unsafe-inline' 'unsafe-eval'"

	# Set the Referrer-Policy
	# no-referrer-when-downgrade - The origin, path, and querystring of the URL are sent as a referrer when
	# the protocol security level stays the same or improves,
	# but isn't sent to less secure destinations.
	Header set Referrer-Policy "no-referrer-when-downgrade"

	# Set the Feature-policy
	Header set Feature-Policy "vibrate 'self'; push *; camera 'none'; microphone 'none'"
	</IfModule>

	# ##################################
	# PERFORMANCE
	# ##################################

	# cds - BEGIN DEFLATE COMPRESSION
	<IfModule mod_deflate.c>
	# Compress HTML, CSS, JavaScript, Text, XML and fonts
	<IfModule mod_filter.c>
	FilterDeclare COMPRESS
	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/css
	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/html
	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/javascript
	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/plain
	FilterProvider COMPRESS DEFLATE resp=Content-Type $text/xml
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/javascript

	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/json
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-javascript
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/atom+xml
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/rss+xml
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xhtml+xml
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xml

	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/vnd.ms-fontobject
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-ttf
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-opentype
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-otf
	FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-truetype
	FilterProvider COMPRESS DEFLATE resp=Content-Type $font/opentype

	FilterProvider COMPRESS DEFLATE resp=Content-Type $image/svg+xml
	FilterProvider COMPRESS DEFLATE resp=Content-Type $image/x-icon

	FilterChain COMPRESS
	FilterProtocol COMPRESS DEFLATE change=yes;byteranges=no
	</IfModule>
	<IfModule !mod_filter.c>
	# Compress HTML, CSS, JavaScript, Text, XML and fonts
	AddOutputFilterByType DEFLATE application/javascript
	AddOutputFilterByType DEFLATE application/rss+xml
	AddOutputFilterByType DEFLATE application/vnd.ms-fontobject
	AddOutputFilterByType DEFLATE application/x-font
	AddOutputFilterByType DEFLATE application/x-font-opentype
	AddOutputFilterByType DEFLATE application/x-font-otf
	AddOutputFilterByType DEFLATE application/x-font-truetype
	AddOutputFilterByType DEFLATE application/x-font-ttf
	AddOutputFilterByType DEFLATE application/x-javascript
	AddOutputFilterByType DEFLATE application/xhtml+xml
	AddOutputFilterByType DEFLATE application/xml
	AddOutputFilterByType DEFLATE font/opentype
	AddOutputFilterByType DEFLATE font/otf
	AddOutputFilterByType DEFLATE font/ttf
	AddOutputFilterByType DEFLATE image/svg+xml
	AddOutputFilterByType DEFLATE image/x-icon
	AddOutputFilterByType DEFLATE text/css
	AddOutputFilterByType DEFLATE text/html
	AddOutputFilterByType DEFLATE text/javascript
	AddOutputFilterByType DEFLATE text/plain
	AddOutputFilterByType DEFLATE text/xml
	</IfModule>
	# Remove browser bugs (only needed for really old browsers)
	<IfModule mod_setenvif.c>
	BrowserMatch ^Mozilla/4 gzip-only-text/html
	BrowserMatch ^Mozilla/4\.0[678] no-gzip
	BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
	SetEnvIfNoCase Request_URI \.(?:gif\|jpe?g\|png)$ no-gzip dont-vary
	</IfModule>
	<IfModule mod_headers.c>
	Header append Vary User-Agent env=!dont-vary
	Header append Vary Accept-Encoding
	</IfModule>
	</IfModule>
	# cds - END DEFLATE COMPRESSION

	# cds - START EXPIRES CACHING - Optimizing cache-control #
	<IfModule mod_expires.c>
	ExpiresActive On
	ExpiresDefault "access plus 1 month"
	ExpiresByType text/html "access plus 1 seconds"
	ExpiresByType text/xml "access plus 1 seconds"
	ExpiresByType text/plain "access plus 1 seconds"
	ExpiresByType application/xml "access plus 1 seconds"
	ExpiresByType application/rss+xml "access plus 1 seconds"
	ExpiresByType application/json "access plus 1 seconds"
	ExpiresByType text/css "access plus 1 month"
	ExpiresByType text/javascript "access plus 1 month"
	ExpiresByType application/javascript "access plus 1 month"
	ExpiresByType application/x-javascript "access plus 1 month"
	ExpiresByType image/x-ico "access plus 1 year"
	ExpiresByType image/x-icon "access plus 1 year"
	ExpiresByType image/gif "access plus 1 year"
	ExpiresByType image/png "access plus 1 year"
	ExpiresByType image/jpe "access plus 1 year"
	ExpiresByType image/jpg "access plus 1 year"
	ExpiresByType image/jpeg "access plus 1 year"
	ExpiresByType video/ogg "access plus 1 month"
	ExpiresByType audio/ogg "access plus 1 month"
	ExpiresByType video/mp4 "access plus 1 month"
	ExpiresByType video/webm "access plus 1 month"
	ExpiresByType font/truetype "access plus 1 month"
	ExpiresByType font/opentype "access plus 1 month"
	ExpiresByType application/x-font-woff "access plus 1 month"
	ExpiresByType image/svg+xml "access plus 1 year"
	ExpiresByType application/pdf "access plus 1 month"
	ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
	<IfModule mod_mime.c>
	AddType image/vnd.microsoft.icon .ico
	ExpiresByType image/vnd.microsoft.icon "access plus 1 year"
	</IfModule>
	<IfModule mod_headers.c>
	# Turn ETags Off
	Header unset ETag
	Header unset Pragma
	Header unset Last-Modified
	Header set Connection keep-alive
	Header append Cache-Control "public, no-transform, must-revalidate"
	</IfModule>
	</IfModule>
	# cds - END EXPIRES CACHING - Optimizing cache-control #

	## cds - BEGIN Cache-Control Headers
	#<ifModule mod_headers.c>
	#<filesMatch "\.(ico\|jpeg\|jpg\|png\|gif\|swf\|pdf\|svg)$">
	#Header set Cache-Control "public"
	#</filesMatch>
	#<filesMatch "\.(css)$">
	#Header set Cache-Control "public"
	#</filesMatch>
	#<filesMatch "\.(js)$">
	#Header set Cache-Control "private"
	#</filesMatch>
	#<filesMatch "\.(x?html?\|php)$">
	#Header set Cache-Control "private, must-revalidate"
	#</filesMatch>
	#</ifModule>
	## cds - END Cache-Control Headers

	# Now that we're sending far-future expires headers (previous step),
	# we can disable all ETags that otherwise would have been sent by the server
	# From: https://htaccessbook.com/disable-etags/
	FileETag none

	# BEGIN WordPress
	RewriteEngine On
	RewriteBase /
	RewriteRule ^index\.php$ - [L]
	RewriteCond %{REQUEST_FILENAME} !-f
	RewriteCond %{REQUEST_FILENAME} !-d
	RewriteRule . /index.php [L]
	# END WordPress
	# Block PHP Files in Uploads Directory
	<FilesMatch "\.(?i:php)$">
	<IfModule !mod_authz_core.c>
	Order allow,deny
	Deny from all
	</IfModule>
	<IfModule mod_authz_core.c>
	Require all denied
	</IfModule>
	</FilesMatch>
	<?php
	// WP memory settings
	// define('WP_MEMORY_LIMIT', '256M');

	// Enable debug log in wp-content/debug.log
	define('WP_DEBUG', false);
	define('WP_DEBUG_LOG', false);
	define('WP_DEBUG_DISPLAY', false);

	// Limit revisions to 3
	define('WP_POST_REVISIONS', 3);

	// OR
	// Disable revisions
	// define('WP_POST_REVISIONS', false);

	// Require SSL for Admin and Logins
	define( 'FORCE_SSL_ADMIN', true );

	// Disable the Plugin and Theme Editor
	define( 'DISALLOW_FILE_EDIT', true );

	// Block external URL requests by defining WP_HTTP_BLOCK_EXTERNAL as true and this will only allow localhost and your blog to make requests
	define( 'WP_HTTP_BLOCK_EXTERNAL', true );
	// define( 'WP_ACCESSIBLE_HOSTS', 'api.wordpress.org,*.github.com' ); //comma separated list of hostnames to allow, wildcard domains are supported

	// Solve problem of wordpress asking for ftp
	// when updating plugins in localhost
	// define('FS_METHOD','direct');
	<?php

	/************************************************************************
	* load Optimization file, which has various
	* functions to improve pagespeed of the site
	* and cleanup WP
	***********************************************************************/
	include( get_stylesheet_directory() . './cds-optimizations-n-tweaks.php' );

	/************************************************************************
	* load cds-wp-admin-tweaks-n-extras file, which has various
	* functions to make changes/additions to the WP admin area
	***********************************************************************/
	include( get_stylesheet_directory() . './cds-wp-admin-tweaks-n-extras.php' );
	<?php
	/**
	* CubeDesigns - Wordpress Optimizations and Tweaks
	*
	* Some of the below function are from the Plugin: Meta Generator and Version Info Remover
	* (https://wordpress.org/plugins/meta-generator-and-version-info-remover/)
	*/


	/************************************************************************
	* Header items cleaning.
	*
	* @return void
	***********************************************************************/
	function cds_clean_the_header_outout() {
	remove_action( 'wp_head', 'wp_generator' ); // Remove WP Generator Vesion.
	remove_action( 'wp_head', 'wp_resource_hints', 2 ); // Remove s.w.org DNS-Prefetch.
	remove_action( 'wp_head', 'wlwmanifest_link' ); // Remove wlwmanifest.xml.
	remove_action( 'wp_head', 'rsd_link' ); // Remove Really Simple Discovery Link.
	remove_action( 'wp_head', 'wp_shortlink_wp_head', 10, 0 ); // Remove Shortlink URL.
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 ); // Remove Emoji's Styles and Scripts.
	remove_action( 'wp_print_styles', 'print_emoji_styles' ); // Remove Emoji's Styles and Scripts.
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' ); // Remove Emoji's Styles and Scripts from Admin.
	remove_action( 'admin_print_styles', 'print_emoji_styles' ); // Remove Emoji's Styles and Scripts from Admin.
	remove_action( 'wp_head', 'index_rel_link' ); // Remove Link to Home Page.
	remove_action( 'wp_head', 'feed_links_extra', 3 ); // Remove Every Extra Links to RSS Feeds.
	remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 ); // Remove Prev-Next Links from Header - Not from Post.
	remove_action( 'wp_head', 'adjacent_posts_rel_link', 10, 0 ); // Remove Prev-Next Links.
	remove_action( 'wp_head', 'start_post_rel_link', 10, 0 ); // Remove Random Link Post.
	remove_action( 'wp_head', 'parent_post_rel_link', 10, 0 ); // Remove parent Post Link.

	add_filter( 'the_generator', '__return_false' ); // Remove Generator Name from RSS Feed.
	}
	add_action( 'after_setup_theme', 'cds_clean_the_header_outout' );


	/************************************************************************
	* Remove WPML generator
	***********************************************************************/
	if ( !empty ( $GLOBALS['sitepress'] ) ) {
	function cds_remove_wpml_generator() {
	remove_action(
	current_filter(),
	array ( $GLOBALS['sitepress'], 'meta_generator_tag' )
	);
	}
	add_action( 'wp_head', 'cds_remove_wpml_generator', 0 );
	}


	/************************************************************************
	* Remove Slider Revolution generator
	***********************************************************************/
	function cds_remove_revslider_meta_tag() {
	return '';
	}
	add_filter( 'revslider_meta_generator', 'cds_remove_revslider_meta_tag' );


	/************************************************************************
	* Remove Visual Composer / WPBakery Page Builder generator
	***********************************************************************/
	function cds_remove_visual_composer_generator() {
	if ( class_exists( 'Vc_Manager' ) \|\| class_exists( 'Vc_Base' ) ) {
	remove_action('wp_head', array(visual_composer(), 'addMetaData'));
	}
	}
	add_action('init', 'cds_remove_visual_composer_generator', 100);


	/************************************************************************
	* Remove comment-reply.min.js completely
	***********************************************************************/
	function cds_remove_comment_reply_js() {
	wp_deregister_script( 'comment-reply' );
	}
	add_action('init', 'cds_remove_comment_reply_js', 10);


	/************************************************************************
	* Remove jQuery Migrate Script from header
	* and Load jQuery from Google API
	***********************************************************************/
	function cds_remove_jquery_migrate_load_google_hosted_jquery(){
	if (!is_admin()) {
	wp_deregister_script('jquery');
	wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js', false, null);
	wp_enqueue_script('jquery');
	}
	}
	add_action('init','cds_remove_jquery_migrate_load_google_hosted_jquery');


	/************************************************************************
	* Remove Yoast SEO comments
	***********************************************************************/
	function cbs_remove_yoast_seo_comments() {
	if ( ! class_exists( 'WPSEO_Frontend' ) ) {
	return;
	}
	$instance = WPSEO_Frontend::get_instance();
	// To ensure that future version of the plugin does not cause any problem
	if ( ! method_exists( $instance, 'debug_mark') ) {
	return;
	}
	remove_action( 'wpseo_head', array( $instance, 'debug_mark' ), 2 );
	}
	add_action('template_redirect', 'cbs_remove_yoast_seo_comments', 9999);

	add_filter('wpseo_debug_markers', '__return_false', 9999); // Requires Yoast > v14.0

	/************************************************************************
	* Remove Query Strings (the version) from script and style files,
	* some files won't be cached if there is a query string in them
	***********************************************************************/
	// function cds_remove_script_version( $src ){
	// $parts = explode( '?ver', $src );
	// return $parts[0];
	// }
	// add_filter( 'script_loader_src', 'cds_remove_script_version', 15, 1 );
	// add_filter( 'style_loader_src', 'cds_remove_script_version', 15, 1 );


	/************************************************************************
	* remove wp version param from any enqueued scripts
	* (using wp_enqueue_script()) or styles (using wp_enqueue_style()).
	***********************************************************************/
	function cds_remove_appended_version_script_style( $target_url ) {
	$filename_arr = explode('?', basename($target_url));
	$filename = $filename_arr[0];

	/* check if "ver=" argument exists in the url or not */
	if (strpos( $target_url, 'ver=' )) {
	$target_url = remove_query_arg( 'ver', $target_url );
	}
	/* check if "version=" argument exists in the url or not */
	if (strpos( $target_url, 'version=' )) {
	$target_url = remove_query_arg( 'version', $target_url );
	}
	return $target_url;
	}
	/**
	* Priority set to 20000. Higher numbers correspond with later execution.
	* Hook into the style loader and remove the version information.
	*/
	add_filter('style_loader_src', 'cds_remove_appended_version_script_style', 20000);
	/**
	* Hook into the script loader and remove the version information.
	*/
	add_filter('script_loader_src', 'cds_remove_appended_version_script_style', 20000);
	<?php
	/**
	* CubeDesigns - Wordpress Admin Tweaks and Extras
	*
	*/



	/************************************************************************
	* Add and Display featured image column in Posts list
	***********************************************************************/
	function cds_add_featured_image_column( $columns ) {
	$columns['featured_image_thumb'] = 'Featured Image';
	return $columns;
	}
	add_filter('manage_posts_columns' , 'cds_add_featured_image_column', 5);

	function cds_display_featured_image_column_data( $column, $post_id ) {
	switch ( $column ) {
	case 'featured_image_thumb':
	echo get_the_post_thumbnail($post_id, 'thumbnail');
	break;
	}
	}
	add_action( 'manage_posts_custom_column' , 'cds_display_featured_image_column_data', 5, 2 );
	if ( current_user_can( 'manage_options' ) && get_current_user_id() == 2 ) {
	global $wpdb;

	// Get expired wp_sessions *use LIMIT if you have a LOT of wp_sessions
	$expiration_keys = $wpdb->get_results( "
	SELECT option_name, option_value
	FROM $wpdb->options
	WHERE option_name LIKE '_wp_session_expires_%'
	AND option_value < NOW()
	LIMIT 0, 50000
	" );

	$now = time(); // EPOCH time
	$expired_sessions = array();

	foreach( $expiration_keys as $expiration ) {
	// Double check that the session has expired
	if ( $now > intval( $expiration->option_value ) ) {
	// Get the session ID by parsing the option_name
	$session_id = str_replace("_wp_session_expires_", "", $expiration->option_name);

	$expired_sessions[] = $expiration->option_name;
	$expired_sessions[] = "_wp_session_$session_id";
	}
	}

	// Delete all expired sessions in a single query
	if ( ! empty( $expired_sessions ) ) {
	$option_names = implode( "','", $expired_sessions );
	// highlight_string("<?php\n\$option_names =\n" . var_export($option_names) . ";\n");
	$wpdb->query( "DELETE FROM $wpdb->options WHERE option_name IN ('$option_names')" );

	}

	}
	<?php
	/**
	* CubeDesigns - Varius functions for specific cases
	*
	*/


	/**
	* [cds_clean_attached_image_attrs]
	*
	* Remove srcset and sizes in specific page
	*
	* @param [type] $attr [description]
	* @param [type] $attachment [description]
	* @param [type] $size [description]
	* @return [type] [description]
	*/
	function cds_clean_attached_image_attrs( $attr, $attachment, $size ) {
	// Limit to specific page. e.g. posts grid page with lots of images
	// If page is: #some_page_id
	if ( is_page(137) ) {
	// highlight_string("<?php\n\$attr =\n" . var_export($attr, true) . ";\n");
	// Remove srcset and sizes
	if ( isset($attr["srcset"]) ) { unset($attr["srcset"]); }
	if ( isset($attr["sizes"]) ) { unset($attr["sizes"]); }
	}
	return $attr;
	}
	add_filter( 'wp_get_attachment_image_attributes', 'cds_clean_attached_image_attrs', 10, 3 );


	/**
	* [cds_disable_wp_responsive_images]
	*
	* disable srcset on frontend
	*
	* @return [type] [description]
	*/
	function cds_disable_wp_responsive_images() {
	return 1;
	}
	add_filter('max_srcset_image_width', 'cds_disable_wp_responsive_images');


	/**
	* [cds_style_loader_tag_filter]
	* Add display=swap to google fonts, when not having access to the creation enque style
	*
	* @return the modified <link> tag
	*/
	add_filter('style_loader_tag', 'cds_style_loader_tag_filter', 10, 2);
	function cds_style_loader_tag_filter($html, $handle) {
	// add &display=swap in google fonts Roboto
	if ($handle === 'Roboto') {
	if ( function_exists('simplexml_load_file') ) {
	$xmlFromHtml = simplexml_load_string($html);
	$hrefs = $xmlFromHtml->xpath("//@href");

	if (isset($hrefs) && !empty($hrefs) && is_array($hrefs)) {
	foreach($hrefs as $href) {
	$modified_href = (string)$href . '&display=swap';
	$final_link = "<link rel='stylesheet' id='Roboto-css' href='" . $modified_href . "' type='text/css' media='all' />";
	$html = $final_link;
	break;
	}
	}
	}
	}
	return $html;
	}