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WordPress Functions

Useful WordPress Functions

WordPress Functions

This is a list of useful WordPress functions that I often reference to enhance or clean up my sites. Please be careful and make backups.

Hide WordPress Update Nag to All But Admins

// Hide WordPress Update Nag to All But Admins
function hide_update_notice_to_all_but_admin() {
    if ( !current_user_can( 'update_core' ) ) {
        remove_action( 'admin_notices', 'update_nag', 3 );
    }
}
add_action( 'admin_head', 'hide_update_notice_to_all_but_admin', 1 );

Create Proper WordPress Titles

Update: As of WP 4.1, the long version is no longer required – simply add the following to functions.php and remove the <title> tag from your header.

// Create Proper WordPress Titles
add_theme_support( 'title-tag' );

Create Custom WordPress Dashboard Widget

// Create Custom WordPress Dashboard Widget
function dashboard_widget_function() {
    echo '
        <h2>Custom Dashboard Widget</h2>
        <p>Custom content here</p>
    ';
}

function add_dashboard_widgets() {
    wp_add_dashboard_widget( 'custom_dashboard_widget', 'Custom Dashoard Widget', 'dashboard_widget_function' );
}
add_action( 'wp_dashboard_setup', 'add_dashboard_widgets' );

Remove All Dashboard Widgets

// Remove All Dashboard Widgets
function remove_dashboard_widgets() {
    global $wp_meta_boxes;
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_quick_press'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_right_now'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_drafts'] );
    unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments'] );
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_primary'] );
    unset( $wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary'] );
    remove_meta_box( 'dashboard_activity', 'dashboard', 'normal' );
}
add_action( 'wp_dashboard_setup', 'remove_dashboard_widgets' );

Insert Custom Login Logo

// Insert Custom Login Logo
function custom_login_logo() {
    echo '
        <style>
            .login h1 a { background-image: url(image.jpg) !important; background-size: 234px 67px; width:234px; height:67px; display:block; }
        </style>
    ';
}
add_action( 'login_head', 'custom_login_logo' );

Modify Admin Footer Text

// Modify Admin Footer Text
function modify_footer() {
    echo 'Created by <a href="https://www.techpulsetoday.com/" target=_blank>TechPulseToday</a>.';
}
add_filter( 'admin_footer_text', 'modify_footer' );

Enqueue Styles and Scripts

// Enqueue Styles and Scripts
function custom_scripts() {
    wp_enqueue_style( 'bootstrap', get_template_directory_uri() . '/css/bootstrap.min.css', array(), '3.3.6' );
    wp_enqueue_style( 'style', get_template_directory_uri() . '/css/style.css' );
    wp_enqueue_script( 'bootstrap', get_template_directory_uri() . '/js/bootstrap.min.js', array('jquery'), '3.3.6', true );
    wp_enqueue_script( 'script', get_template_directory_uri() . '/js/script.js' );
}

add_action( 'wp_enqueue_scripts', 'custom_scripts' );

Enqueue Google Fonts

// Enqueue Google Fonts
function google_fonts() {
                wp_register_style( 'OpenSans', '//fonts.googleapis.com/css?family=Open+Sans:400,600,700,800' );
                wp_enqueue_style( 'OpenSans' );
        }
    wp_register_style( 'OpenSans', 'http://fonts.googleapis.com/css?family=Open+Sans:400,600,700,800' );
    wp_enqueue_style( 'OpenSans' );
}

add_action( 'wp_print_styles', 'google_fonts' );

Modify Excerpt Length

// Modify Excerpt Length
function custom_excerpt_length( $length ) {
    return 25;
}
add_filter( 'excerpt_length', 'custom_excerpt_length', 999 );

Change Read More Link

// Change Read More Link
function custom_read_more_link() {
    return '<a href="' . get_permalink() . '">Read More</a>';
}
add_filter( 'the_content_more_link', 'custom_read_more_link' );

Change More Excerpt

// Change More Excerpt
function custom_more_excerpt( $more ) {
    return '...';
}
add_filter( 'excerpt_more', 'custom_more_excerpt' );

Disable Emoji Mess

// Disable Emoji Mess
function disable_wp_emojicons() {
    remove_action( 'admin_print_styles', 'print_emoji_styles' );
    remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
    remove_action( 'wp_print_styles', 'print_emoji_styles' );
    remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
    remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
    remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
    add_filter( 'tiny_mce_plugins', 'disable_emojicons_tinymce' );
}
add_action( 'init', 'disable_wp_emojicons' );
function disable_emojicons_tinymce( $plugins ) {
    if ( is_array( $plugins ) ) {
        return array_diff( $plugins, array( 'wpemoji' ) );
    } else {
        return array();
    }
}

Remove Comments

// Removes from admin menu
add_action( 'admin_menu', 'my_remove_admin_menus' );
function my_remove_admin_menus() {
    remove_menu_page( 'edit-comments.php' );
}
// Removes from post and pages
add_action( 'init', 'remove_comment_support', 100 );
function remove_comment_support() {
    remove_post_type_support( 'post', 'comments' );
    remove_post_type_support( 'page', 'comments' );
}
// Removes from admin bar
function mytheme_admin_bar_render() {
    global $wp_admin_bar;
    $wp_admin_bar->remove_menu( 'comments' );
}
add_action( 'wp_before_admin_bar_render', 'mytheme_admin_bar_render' );

Change Media Gallery URL

// Change Media Gallery URL
update_option( 'upload_url_path', 'http://s3.website.com/wp-content/uploads' );

Create Custom Thumbnail Size

// Add 250 x 250 Custom Thumbnail Size
add_image_size( 'custom-thumbnail', 250, 250, true );

Retrieve Thumbnail

<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'custom-thumbnail' );

 echo $thumb[0]; ?>

Since WordPress 4.4.0 you can use:

the_post_thumbnail_url( $size );

Add Categories for Attachments

// Add Categories for Attachments
function add_categories_for_attachments() {
    register_taxonomy_for_object_type( 'category', 'attachment' );
}
add_action( 'init' , 'add_categories_for_attachments' );

Add Tags for Attachments

// Add Tags for Attachments
function add_tags_for_attachments() {
    register_taxonomy_for_object_type( 'post_tag', 'attachment' );
}
add_action( 'init' , 'add_tags_for_attachments' );

Add Custom Excerpt to Pages

// Add Custom Excerpt to Pages
function add_page_excerpt() {
    add_post_type_support( 'page', array( 'excerpt' ) );
}
add_action( 'init', 'add_page_excerpt' );

Create a Global String

// Create a Global String
function global_string() {
    return 'String';
}

Retrieve Field

<?php echo global_string(); ?>

Support Featured Images

// Support Featured Images
add_theme_support( 'post-thumbnails' );

Support Search Form

// Support Search Form
add_theme_support( 'html5', array( 'search-form' ) );

Excluding pages from search

// Excluding pages from search
function exclude_pages_from_search() {
    global $wp_post_types;
    $wp_post_types['page']->exclude_from_search = true;
}
add_action( 'init', 'exclude_pages_from_search' );

Disable xmlrpc.php

// Disable XML RPC
add_filter( 'xmlrpc_enabled', '__return_false' );
remove_action( 'wp_head', 'rsd_link' );
remove_action( 'wp_head', 'wlwmanifest_link' );

Escape HTML in Posts

// Escape HTML in <code> or <pre><code> tags.
function escapeHTML($arr) {
    if (version_compare(PHP_VERSION, '5.2.3') >= 0) {
        $output = htmlspecialchars($arr[2], ENT_NOQUOTES, get_bloginfo('charset'), false);
    }
    else {
        $specialChars = array(
            '&' => '&amp;',
            '<' => '&lt;',
            '>' => '&gt;'
        );

        // decode already converted data
        $data = htmlspecialchars_decode( $arr[2] );
        // escapse all data inside <pre>
        $output = strtr( $data, $specialChars );
    }
    if (! empty($output)) {
        return  $arr[1] . $output . $arr[3];
    }   else    {
        return  $arr[1] . $arr[2] . $arr[3];
    }
}
function filterCode($data) { // Uncomment if you want to escape anything within a <pre> tag
    //$modifiedData = preg_replace_callback( '@(<pre.*>)(.*)(<\/pre>)@isU', 'escapeHTML', $data );
    $modifiedData = preg_replace_callback( '@(<code.*>)(.*)(<\/code>)@isU', 'escapeHTML', $data );
    $modifiedData = preg_replace_callback( '@(<tt.*>)(.*)(<\/tt>)@isU', 'escapeHTML', $modifiedData );

    return $modifiedData;
}
add_filter( 'content_save_pre', 'filterCode', 9 );
add_filter( 'excerpt_save_pre', 'filterCode', 9 );

Modified from Escape HTML.

Create Custom Global Settings

// Create Custom Global Settings
function custom_settings_page() { ?>
    <div class="wrap">
    <h1>Custom Settings</h1>
    <form method="post" action="options.php">
        <?php
            settings_fields( 'section' );
            do_settings_sections( 'theme-options' );
            submit_button();
        ?>
    </form>
    </div>
<?php }

function custom_settings_add_menu() {
    add_theme_page( 'Custom Settings', 'Custom Settings', 'manage_options', 'custom-settings', 'custom_settings_page', null, 99 );
}
add_action( 'admin_menu', 'custom_settings_add_menu' );

// Example setting
function setting_twitter() { ?>
    <input type="text" name="twitter" id="twitter" value="<?php echo get_option('twitter'); ?>" />
<?php }

function custom_settings_page_setup() {
    add_settings_section( 'section', 'All Settings', null, 'theme-options' );
    add_settings_field( 'twitter', 'Twitter Username', 'setting_twitter', 'theme-options', 'section' );
    register_setting( 'section', 'twitter' );
}
add_action( 'admin_init', 'custom_settings_page_setup' );

Retrieve Field

<?php echo get_option( 'twitter' ); ?>

Modified from Create a WordPress Theme Settings Page with the Settings API.

Remove WordPress Admin Bar

function remove_admin_bar() {
    remove_action( 'wp_head', '_admin_bar_bump_cb' );
}
add_action( 'get_header', 'remove_admin_bar' );

Add Open Graph Meta Tags

// Add Open Graph Meta Tags
function meta_og() {
    global $post;
    if ( is_single() ) {
        if(has_post_thumbnail($post->ID)) {
            $img_src = wp_get_attachment_image_src(get_post_thumbnail_id( $post->ID ), 'thumbnail');
        } 
        $excerpt = strip_tags($post->post_content);
        $excerpt_more = '';
        if (strlen($excerpt) > 155) {
            $excerpt = substr($excerpt,0,155);
            $excerpt_more = ' ...';
        }
        $excerpt = str_replace('"', '', $excerpt);
        $excerpt = str_replace("'", '', $excerpt);
        $excerptwords = preg_split('/[\n\r\t ]+/', $excerpt, -1, PREG_SPLIT_NO_EMPTY);
        array_pop($excerptwords);
        $excerpt = implode(' ', $excerptwords) . $excerpt_more;
        ?>
<meta name="author" content="Your Name">
<meta name="description" content="<?php echo $excerpt; ?>">
<meta property="og:title" content="<?php echo the_title(); ?>">
<meta property="og:description" content="<?php echo $excerpt; ?>">
<meta property="og:type" content="article">
<meta property="og:url" content="<?php echo the_permalink(); ?>">
<meta property="og:site_name" content="Your Site Name">
<meta property="og:image" content="<?php echo $img_src[0]; ?>">
<?php
    } else {
            return;
    }
}
add_action('wp_head', 'meta_og', 5);

Add Custom Post Type

// Create Custom Post Type
function create_custom_post() {
    register_post_type('custom-post', // slug for custom post type
        array(
        'labels' => array(
            'name' => __('Custom Post'),
        ),
        'public' => true,
        'hierarchical' => true, 
        'has_archive' => true,
        'supports' => array(
            'title',
            'editor',
            'excerpt',
            'thumbnail'
        ), 
        'can_export' => true,
        'taxonomies' => array(
                'post_tag',
                'category'
        )
    ));
}
add_action('init', 'create_custom_post');

Implement Preconnect to Google Fonts in Themes

function twentyfifteen_resource_hints( $urls, $relation_type ) {
    // Checks whether the subject is carrying the source of fonts google and the `$relation_type` equals preconnect.
    // Replace `enqueue_font_id` the `ID` used in loading the source.
    if ( wp_style_is( 'enqueue_font_id', 'queue' ) && 'preconnect' === $relation_type ) {
        // Checks whether the version of WordPress is greater than or equal to 4.7
        // to ensure conmpatibilidade with older versions
        // because the 4.7 has become necessary to return an array instead of string
        if ( version_compare( $GLOBALS['wp_version'], '4.7-alpha', '>=' ) ) {
            // Array with url google fonts and crossorigin
            $urls[] = array(
                'href' => 'https://fonts.gstatic.com',
                'crossorigin',
            );
        } else {
            // String with url google fonts
            $urls[] = 'https://fonts.gstatic.com';
        }
    }
    return $urls;
}
add_filter( 'wp_resource_hints', 'twentyfifteen_resource_hints', 10, 2 );

Add Thumbnail Column to Post Listing

add_image_size( 'admin-list-thumb', 80, 80, false );

function wpcs_add_thumbnail_columns( $columns ) {

    if ( !is_array( $columns ) )
        $columns = array();
    $new = array();

    foreach( $columns as $key => $title ) {
        if ( $key == 'title' ) // Put the Thumbnail column before the Title column
            $new['featured_thumb'] = __( 'Image');
        $new[$key] = $title;
    }
    return $new;
}

function wpcs_add_thumbnail_columns_data( $column, $post_id ) {
    switch ( $column ) {
    case 'featured_thumb':
        echo '<a href="' . $post_id . '">';
        echo the_post_thumbnail( 'admin-list-thumb' );
        echo '</a>';
        break;
    }
}

if ( function_exists( 'add_theme_support' ) ) {
    add_filter( 'manage_posts_columns' , 'wpcs_add_thumbnail_columns' );
    add_action( 'manage_posts_custom_column' , 'wpcs_add_thumbnail_columns_data', 10, 2 );
}

Add Lead Class to First Paragraph

// Add Lead Class to First Paragraph
function first_paragraph( $content ) {
    return preg_replace('/<p([^>]+)?>/', '<p$1 class="lead">', $content, 1);
}
add_filter( 'the_content', 'first_paragraph' );

Adds a lead class to the first paragraph in the_content.

Source

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ABOUT
Vijayan J

Thanks for stopping by guys! I'm Vijayan and Techpulse is my beloved brainchild. Currently working as a PHP developer in a digital marketing start-up, I'm overly passionate about not just learning new things but also putting those into practice. I swear by a quote I once came across... 'What separates successful people from unsuccessful people is the former's ability to execute'. Feel free to reach out to me if you have any questions, suggestions or feedback. Hoping to see more of you here!

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