WordPress PROTIPs

__wordpress.php

/**
 * A selection of handy code snippets, plugins, and best practices for WordPress development.
 *
 */

_plugins.md

Useful plugins

*WP-VIP–approved

• Advanced Custom Fields
• Advanced Excerpt*
• WP Caregiver
• Column Shortcodes*
• Edit Flow*
• Email Encoder Bundle
• Get the Image*
• BWP Google XML Sitemaps
• JSON Feed*
• Multiple Post Thumbnails*
• WP Pagenavi*
• TGM Plugin Activation
• PubSubHubbub
  Optimises RSS feed for Flipboard
• Shortcake*
• Simple Page Ordering*
• WP Thumb
• Safe Redirect Manager*

Server-related

Asset optimisation

• Autoptimize
• MinQueue

Caching plugins

• W3 Total Cache
• WP Super Cache
• Cachify

Database migration

• BackUpWordPress
• WP Migrate DB Pro
• WP Optimize
• WP Remote

Not a plugin but hella useful: DB Search and Replace

Third-party connections

• Facebook*
• WP Google Analytics*
• Latest Tweets
• MailChimp for WordPress

backend.php

<?php
/**
 * Strip `width` & `height` attributes from `img` elements.
 *
 * @file functions.php
 */
    function remove_width_and_height_attribute( $html ) {
        return preg_replace( '/(height|width)="\d*"\s/', "", $html );
    }
    
    add_filter( 'get_image_tag', 'remove_width_and_height_attribute', 10 );
    add_filter( 'post_thumbnail_html', 'remove_width_and_height_attribute', 10 );
    add_filter( 'image_send_to_editor', 'remove_width_and_height_attribute', 10 );


/**
 * Prevent file editing via the dashboard editor.
 * 
 * @file wp-config.php
 */
    define( 'DISALLOW_FILE_EDIT', true);



?>

frontend.php

<?php
/**
 * Display post time in relation to current time.
 *
 * @file page.php
 */
    echo 'Posted ' . human_time_diff( get_the_time('U'), current_time('timestamp') ) . ' ago.';


/**
 * Display estimated reading time, ala Medium, et al.
 * 
 * Assumes a reading speed of 200 words per minute.
 *
 * @todo make this more WordPress-friendly.
 */
    function read_time($text){
        $words = str_word_count(strip_tags($text));
        $min = floor($words / 200);
        if($min === 0){
            return 'min read';
        }
        return $min . 'min read';
    }



?>

gistfile1.php

<?php
/**
 * Remove unnecessary self-closing tags
 *
 * @file functions.php
 */
    function remove_self_closing_tags($input) {
        return str_replace(' />', '>', $input);
    }
    add_filter('get_avatar',          'remove_self_closing_tags');  // <img />
    add_filter('comment_id_fields',   'remove_self_closing_tags');  // <input />
    add_filter('post_thumbnail_html', 'remove_self_closing_tags');  // <img />
?>

gistfile10.php

<?php
/**
 * Adjust post revisioning and autosaving.
 *
 * @file wp-config.php
 */
    // Adjust autosave frequency, in seconds
    define('AUTOSAVE_INTERVAL', 300 );
    
    // Limit number of revisions
    define('WP_POST_REVISIONS', 3);
    
    // Or disable revisions completely
    //define('WP_POST_REVISIONS', false );
?>

gistfile11.php

<?php
/**
 * Display only posts which haven't "expired".
 *
 * @file page.php
 */
    if (have_posts()) :
        while (have_posts()) : the_post();
        
            $expirationtime = get_post_custom_values('expiration');  // Get date value from custom field
            
            if (is_array($expirationtime)) {
                $expirestring = implode($expirationtime);
            }

            $secondsbetween = strtotime($expirestring)-time();
            
            if ( $secondsbetween > 0 ) {
                
                // Post content is displayed here
                
            }
            
        endwhile;
    endif;
?>

gistfile12.php

<?php
/**
 * Display estimated reading time, ala Medium, et al.
 * 
 * Assumes a reading speed of 200 words per minute.
 *
 * @todo make this more WordPress-friendly.
 */
    function read_time($text){
        $words = str_word_count(strip_tags($text));
        $min = floor($words / 200);
        if($min === 0){
            return 'min read';
        }
        return $min . 'min read';
    }
?>

gistfile13.php

<?php
/**
 * Display post time in relation to current time.
 *
 * @file page.php
 */
    echo 'Posted ' . human_time_diff( get_the_time('U'), current_time('timestamp') ) . ' ago.';
?>

gistfile14.php

<?php
/**
 * Create a Dashboard page with theme-specific settings controls.
 *
 * @file functions.php
 */
    add_action( 'admin_menu', 'my_admin_menu' );
    
    function my_admin_menu() {
        add_theme_page( 'My Theme Options', 'My Theme Options', 'edit_theme_options', 'my-theme-options', 'my_theme_options' );
    }

    function my_theme_options() {
?>

        <h2>Theme Options</h2>
        <form method="post" action="options.php">
            <?php wp_nonce_field( 'update-options' ); ?>
            <?php settings_fields( 'my-options' ); ?>
            <?php do_settings_sections( 'my-options' ); ?>
            <?php submit_button(); ?>
        </form>

<?php
    }

    add_action( 'admin_init', 'my_register_admin_settings' );

    function my_register_admin_settings() {
        register_setting( 'my-options', 'my-options' );
        
        // Settings fields and sections
        add_settings_section( 'section_typography', 'Typography Options', 'my_section_typography', 'my-options' );
        add_settings_field( 'primary-font', 'Primary Font', 'my_field_primary_font', 'my-options', 'section_typography' );
    }
    
    function my_section_typography() {
        echo 'Section description can go here.';
    }

    function my_field_primary_font() {
        echo 'Font control will go here.';
    }
?>

gistfile15.php

<?php
/**
 * Custom login screen logo image
 * 
 * Image should be 80px square, or overwrite the default height/width properties.
 *
 * @file functions.php
 */
    function custom_login_logo() {
        echo '<style type="text/css">
        .login h1 a {
            background-image: url(' . get_bloginfo('template_directory') . '/images/logo.png) !important;
            background-image: none, url(' . get_bloginfo('template_directory') . '/images/logo.svg) !important;
        }
        </style>';
    }
    add_action('login_head', 'custom_login_logo');
?>

gistfile2.php

<?php 
/**
 * Allow SVG files in the media uploader
 *
 * @file functions.php
 */
    function add_mime_types( $mimes ){
        $mimes['svg'] = 'image/svg+xml';
        return $mimes;
    }
    add_filter( 'upload_mimes', 'add_mime_types' );
?>

gistfile3.txt

@link http://www.paulund.co.uk/add-facebook-open-graph-tags-to-wordpress

gistfile4.php

<?php 
/**
 * Adjust JPG compression quality.
 *
 * @file functions.php
 */
    add_filter( 'jpeg_quality', function($arg) { return 100; } );
    add_filter( 'wp_editor_set_quality', function($arg) { return 100; } );
?>

gistfile5.php

<?php
/**
 * Add contact notice to Core Update notice
 * First, remove the default notice.
 * Next, replicate the original function, with our updated notice text.
 *
 * @todo Find a way to append to the original notice instead of duplicating
 */
add_action( 'admin_init', 'remove_default_update_nag' );

function remove_default_update_nag() {
	remove_action( 'admin_notices', 'update_nag', 3 );
	remove_action( 'network_admin_notices', 'update_nag', 3 );
}


add_action( 'admin_notices', 'custom_update_nag', 3 );
add_action( 'network_admin_notices', 'custom_update_nag', 3 );

function  custom_update_nag();
    if ( is_multisite() && !current_user_can('update_core') )
		return false;

	global $pagenow;

	if ( 'update-core.php' == $pagenow )
		return;

	$cur = get_preferred_from_update_core();

	if ( ! isset( $cur->response ) || $cur->response != 'upgrade' )
		return false;

	if ( current_user_can('update_core') ) {
		$msg = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! <a href="%2$s">Please update now</a>.<br>Reach out to your friends at <a href="http://overhaulmedia.com/" target="_blank">Overhaul Media</a> for assistance!'), $cur->current, network_admin_url( 'update-core.php' ) );
	} else {
		$msg = sprintf( __('<a href="http://codex.wordpress.org/Version_%1$s">WordPress %1$s</a> is available! Please notify the site administrator.<br>Reach out to your friends at <a href="http://overhaulmedia.com/" target="_blank">Overhaul Media</a> for assistance!'), $cur->current );
	}
	echo '<div class="update-nag">' . $msg . '</div>';
}
?>

gistfile6.php

<?php
/**
 * Display gallery of attached images
 *
 * @file page.php
 */
    $args = array(  
        'numberposts'       => -1,              // Using -1 loads all posts  
        'orderby'           => 'menu_order',    // This ensures images are in the order set in the page media manager  
        'order'             => 'ASC',  
        'post_mime_type'    => 'image',         // Make sure it doesn't pull other resources, like videos  
        'post_parent'       => $post->ID,       // Important part - ensures the associated images are loaded 
        'post_status'       => null, 
        'post_type'         => 'attachment',  
    );  
  
    $images = get_children( $args );
    
    if ( $images ) {
        foreach ( $images as $image ) {
            $sized_image = wp_get_attachment_image_src( $image->ID, 'medium' );
            
            echo $sized_image[0];
            echo $image->guid;
        }
    }
?>

gistfile7.php

<?php
/**
 * Display featured image thumbnail in post admin columns
 *
 * @file functions.php
 */
// Setup Admin Thumbnail Size
    if ( function_exists( 'add_theme_support' ) ) {
        add_image_size( 'admin-thumb', 100, 999999 );  // 100 pixels wide (and unlimited height)
    }

// Thumbnails to Admin Post View
    add_filter( 'manage_posts_columns', 'posts_columns', 5 );
    add_action( 'manage_posts_custom_column', 'posts_custom_columns', 5, 2 );

    function posts_columns($defaults){
        $defaults['post_thumb'] = __( 'Thumbnail' );
        return $defaults;
    }

    function posts_custom_columns($column_name, $id){
        if ( $column_name === 'post_thumb' ) {
            the_post_thumbnail( 'admin-thumb' );
        }
    }
?>

gistfile8.php

<?php
/**
 * Automagically set a Featured Image for a post using the first image in the content.
 *
 * @file functions.php
 */
    function autoset_featured() {
        global $post;
        $already_has_thumb = has_post_thumbnail($post->ID);
        
        if( ! $already_has_thumb ) {
            $attached_image = get_children( "post_parent=$post->ID&post_type=attachment&post_mime_type=image&numberposts=1" );
            if( $attached_image ) {
                foreach ($attached_image as $attachment_id => $attachment) {
                    set_post_thumbnail($post->ID, $attachment_id);
                }
            }
        }
    }
    
    add_action('the_post', 'autoset_featured');
    add_action('save_post', 'autoset_featured');
    add_action('draft_to_publish', 'autoset_featured');
    add_action('new_to_publish', 'autoset_featured');
    add_action('pending_to_publish', 'autoset_featured');
    add_action('future_to_publish', 'autoset_featured');
?>

gistfile9.php

<?php
/**
 * Hide the admin bar for users that can't edit posts.
 *
 * @file functions.php
 */
    add_action('set_current_user', 'hide_the_adminbar');
    
    function hide_the_adminbar() {
        if ( ! current_user_can('edit_posts') ) {
            show_admin_bar(false);
        }
    }
?>