介绍50个 WordPress 动作挂钩（31-40）

<?php

add_action( 'wp_default_scripts', 'wp_default_scripts_example' );
function wp_default_scripts_example( &$scripts ) {

    if ( ! is_admin() ) {

        $scripts->remove( 'jquery' );
        $scripts->add( 'jquery', false, array( 'jquery-core' ) );

    }

}

// Example Source: http://aahacreative.com/2013/08/05/remove-jquery-migrate-wordpress-36/

?>

<?php

add_action( 'wp_head', 'wp_head_example' );

function wp_head_example() {
    global $post;

    // default image
    $site_logo = get_stylesheet_directory_uri() . 'https://static.wpdaxue.com/images/logo.png';

    // homepage
    if ( is_home() ) {
        echo '<meta property="og:type" content="website" />';
        echo '<meta property="og:url" content="' . get_bloginfo( 'url' ) . '" />';
        echo '<meta property="og:title" content="' . esc_attr( get_bloginfo( 'name' ) ) . '" />';
        echo '<meta property="og:image" content="' . $site_logo . '" />';
        echo '<meta property="og:description" content="' . esc_attr( get_bloginfo( 'description' ) ) . '" />';
    }

    // single post or page
    elseif ( is_singular() ) {
        echo '<meta property="og:type" content="article" />';
        echo '<meta property="og:url" content="' . get_permalink() . '" />';
        echo '<meta property="og:title" content="' . esc_attr( get_the_title() ) . '" />';
        if ( has_post_thumbnail( $post->ID ) ) {
            $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'large' );
            echo '<meta property="og:image" content="' . esc_attr( $image[0] ) . '" />';
        } else
            echo '<meta property="og:image" content="' . $site_logo . '" />';
        echo '<meta property="og:description" content="' . esc_attr( get_the_excerpt() ) . '" />';
    }
}

// Example Source: http://wpdevsnippets.com/set-opengraph-meta-tags-fix-facebook-share/

?>

<?php

add_action( 'after_setup_theme', 'after_setup_theme_example' );

function after_setup_theme_example() {

    add_editor_style();
    add_theme_support( 'post-formats', array( 'video', 'gallery' ) );
    add_theme_support( 'post-thumbnails' );

}

?>

<?php

add_filter( 'manage_media_columns', 'manage_media_columns_example' );
add_action( 'manage_media_custom_column', 'manage_media_custom_column_example', 10, 2 );

function manage_media_columns_example( $columns ) {
    $columns[ 'wps_post_attachments_id' ] = __( 'ID', 'theme-name' );
    return $columns;
}

function manage_media_custom_column_example( $column_name, $attachment_id ){

    if ( 'wps_post_attachments_id' === $column_name ) {
        echo $attachment_id;
    }
}

// Example Source: http://wpsnipp.com/index.php/functions-php/media-library-admin-columns-with-attachment-id/

?>

<?php

add_action( 'comment_unapproved_to_approved', 'comment_unapproved_to_approved_example' ); 

function comment_unapproved_to_approved_example( $comment ) {

    $commenter_email = $comment->comment_author_email;
    $commenter_name  = $comment->comment_author;
    $post_url = get_comment_link( $comment );
    $subject = "Your comment is up!";
    $message = "Hello $commenter_name,\n\nYour comment has been approved!You can view it below:\n\n$post_url\n\nThank you for sharing your ideas with us!";

    wp_mail( $commenter_email, $subject, $message );
}

?>

<?php

add_action( 'template_redirect', 'template_redirect_example' );
function template_redirect_example() {

    if ( is_search() ) {

        global $wp_query;

        if ( 1 == $wp_query->post_count && 1 == $wp_query->max_num_pages ) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
            exit;
        }

    }

}

// Example Source: http://www.elegantthemes.com/blog/tips-tricks/eight-useful-code-snippets-for-wordpress

?>

<?php

add_action( 'do_feed',      'do_feed_example', 1 );
add_action( 'do_feed_atom', 'do_feed_example', 1 );
add_action( 'do_feed_rdf',  'do_feed_example', 1 );
add_action( 'do_feed_rss2', 'do_feed_example', 1 );
add_action( 'do_feed_rss',  'do_feed_example', 1 );

function do_feed_example() {
    wp_die( __( '<h1>Feed not available, please visit our <a rel="nofollow noopener noreferrer" href="' . get_bloginfo( 'url' ) . '">Home Page</a>!</h1>' ) );
}

// Example Source: http://wpdevsnippets.com/disable-rss-feed/

?>

<?php

add_action( 'admin_bar_menu', 'admin_bar_menu_example' );
add_filter( 'show_admin_bar', '__return_true' , 1000 );

function admin_bar_menu_example( $wp_admin_bar ) {

    if ( ! is_user_logged_in() ) {

        $wp_admin_bar->add_menu( array( 'title' => __( 'Log In' ), 'href' => wp_login_url() ) );
        $wp_admin_bar->add_menu( array( 'title' => __( 'Contact' ), 'href' => 'http://www.mywebsite.com/contact/' ) );

    }

}

// Example source: http://blog.ftwr.co.uk/archives/2011/01/05/always-show-admin-bar/

?>

<?php

add_action( 'wp_list_categories', 'wp_list_categories_example' );

function wp_list_categories_example() {
    return preg_replace( '` title="(.+)"`', '', $output );    
}

// Example Source: http://wpsnipp.com/index.php/cat/remove-title-attribute-from-wp_list_categories/

?>

<?php

add_action( 'pre_get_search_form', 'pre_get_search_form_example' );
function pre_get_search_form_example( $form ) {
    echo '<div class="search-info">Enter your barcode number below to access the item you want.</div>';
}

?>