General WP Functions

funcitons.php

// For images

$siteMailLogoURL = NULL;
$siteMainLogoAlt = NULL;
if (isset($siteMainLogoID)) {
  $siteMailLogoURL = wp_get_attachment_url($siteMainLogoID);
  $siteMainLogoAlt = get_post_meta($siteMainLogoID, '_wp_attachment_image_alt', true);
}

if (!empty($siteMailLogoURL)) : ?>

<img src="<?php echo $siteMailLogoURL; ?>" <?php echo (!empty($siteMainLogoAlt)) ? "alt='$siteMainLogoAlt'" : ''; ?> />

<?php endif; ?>


/** 
 * for repeaters
*/
	for ($j = 0; $j < $repeaterCount; $j++) {
	$lowerRightBulletText = $pageCF['repeater_base_' . $j . '_text'][0];

	?>
		
	<?php

} // end for loop



/**
 * For search and replace first instance
*/

function str_replace_first($search, $replace, $subject) {
    $pos = strpos($subject, $search);
    if ($pos !== false) {
        return substr_replace($subject, $replace, $pos, strlen($search));
    }
    return $subject;
}

// base functions file:

// change standard login error messages

function escpde_wrong_login() {
  return 'Wrong username or password.';
}
add_filter('login_errors', 'escpde_wrong_login');



add_action('template_redirect', 'escode_custom_disable_author_page');

function escode_custom_disable_author_page() {

        if ( isset( $_GET['author'] ) || is_author() ) {
            global $wp_query;
            $wp_query->set_404();
            status_header( 404 );
            nocache_headers();
        }
        
}

/**
 * Removed authors from sitemap
 */

add_filter( 'wpseo_sitemap_exclude_author', function() {
      return []; 
}, 10, 1 ); 


/**
 * Limit Post Revisions
 */

if (!defined('WP_POST_REVISIONS')) {

 define('WP_POST_REVISIONS', 15);

}


/**
 * Add Security Headers
 */


add_action('send_headers', function() {

    // Enforce the use of HTTPS, if SSL is turned on

    if (is_ssl()) {
    header("Strict-Transport-Security: max-age=31536000; includeSubDomains");
    }

    // Prevent Clickjacking
    header("X-Frame-Options: SAMEORIGIN");

    // Prevent XSS Attack
    // header("Content-Security-Policy: default-src 'self';"); // FF 23+ Chrome 25+ Safari 7+ Opera 19+

    //  header("X-Content-Security-Policy: default-src 'self';"); // IE 10+
    // Block Access If XSS Attack Is Suspected
    header("X-XSS-Protection: 1; mode=block");
    // Prevent MIME-Type Sniffing
    header("X-Content-Type-Options: nosniff");
    // Referrer Policy
    header("Referrer-Policy: no-referrer-when-downgrade");

}, 1);

/**
 * Prevent WordPress from generating extra image sizes
 */

function stop_wp_generating_images( $sizes ) {
  
  /* Default WordPress */
  unset( $sizes[ 'thumbnail' ]);       // Remove Thumbnail (150 x 150 hard cropped)
  unset( $sizes[ 'medium' ]);          // Remove Medium resolution (300 x 300 max height 300px)
  unset( $sizes[ 'medium_large' ]);    // Remove Medium Large (added in WP 4.4) resolution (768 x 0 infinite height)
  unset( $sizes[ 'large' ]);           // Remove Large resolution (1024 x 1024 max height 1024px)
  
  return $sizes;
}

add_filter( 'intermediate_image_sizes_advanced', 'stop_wp_generating_images' );


/**
 * Show Database queries in footer
*/

function db_performance( $visible = false ) {
    $visible = false;
    $stat = sprintf(  '%d queries in %.3f seconds, using %.2fMB memory',
        get_num_queries(),
        timer_stop( 0, 3 ),
        memory_get_peak_usage() / 1024 / 1024
        );
    echo $visible ? $stat : "<!-- DB STATS ARE {$stat} -->" ;
}

// add_action('wp_footer', 'db_performance', 20);


// EDIT ADMIN FOOTER TEXT

function modify_footer() {
    echo 'Created by Louis Fico';
}
add_filter( 'admin_footer_text', 'modify_footer' );


// END EDIT ADMIN FOOTER TEXT


// START ADD TIMESTAMP TO MAIN STYLE TAG

add_filter( 'style_loader_tag',  'add_stylesheet_timestamp', 10, 4 );

function add_stylesheet_timestamp( $html, $handle, $href, $media ){
    // only look for main stylesheet
    $mainStyleSheet = get_stylesheet_directory_uri() . '/style.css';
    // set up a variable that has the file name with the timeppended
    $styleWithTime = 'style.css?ver=' . time(); 
     if( strpos( $mainStyleSheet, $href ) !== false  ){
         $html = str_replace('style.css', $styleWithTime, $html);
    }
    return $html;
}


// END ADD TIMESTAMP TO MAIN STYLE TAG



// START REMOVE SIDEBAR WIDGETS

add_filter( 'sidebars_widgets', 'disable_all_widgets' );

function disable_all_widgets( $sidebars_widgets ) {

  $sidebars_widgets = array( false );

  return $sidebars_widgets;
}



/**
 * Remove comments from YOAST SEO
*/

function escode_remove_yoast_seo_comments() {
        // if the plugin isnt installed then dont do anything
        if ( ! class_exists( 'WPSEO_Frontend' ) ) {
            return;
        }
        $instance = WPSEO_Frontend::get_instance();
        // if the above is no longer a method, then dont do anything  (makes it not break with future yoast updates)
        if ( ! method_exists( $instance, 'debug_mark') ) {
            return;
        }

        // the fun part, removing the debug_mark
        remove_action( 'wpseo_head', array( $instance, 'debug_mark' ), 2 );
}

add_action('template_redirect', 'escode_remove_yoast_seo_comments', 9999);




// remove version from head
remove_action('wp_head', 'wp_generator');

// remove version from the feed
add_filter('the_generator', '__return_empty_string');

// remove version numbers from js and css
function escode_remove_version_scripts_styles($src) {

    // only remove version numbers that begin with ver=
	if (strpos($src,'ver=') !== false) {
		$src = remove_query_arg('ver', $src);
	}
    return $src;
    
}
add_filter('style_loader_src', 'escode_remove_version_scripts_styles', 9999);
add_filter('script_loader_src', 'escode_remove_version_scripts_styles', 9999);


/**
 * Keep jpeg quality at 100
*/

add_filter( 'jpeg_quality', 'escode_jpeg_quality' );

function escode_jpeg_quality() {
return 100;
}



// Disable support for comments and trackbacks in post types
function escode_disable_comments_post_types_support() {
	$post_types = get_post_types();
	foreach ($post_types as $post_type) {
		if(post_type_supports($post_type, 'comments')) {
			remove_post_type_support($post_type, 'comments');
			remove_post_type_support($post_type, 'trackbacks');
		}
	}
}
add_action('admin_init', 'escode_disable_comments_post_types_support');

// Close comments on the front-end
function escode_disable_comments_status() {
	return false;
}
add_filter('comments_open', 'escode_disable_comments_status', 20, 2);
add_filter('pings_open', 'escode_disable_comments_status', 20, 2);

// Hide existing comments
function escode_disable_comments_hide_existing_comments($comments) {
	$comments = array();
	return $comments;
}
add_filter('comments_array', 'escode_disable_comments_hide_existing_comments', 10, 2);