Adiciona informações do facebook a campos personalizados WordPress

add-info-facebook-to-custom-field-wordpress.php

<?php

function foxtemas_insert_facebook_likes_custom_field($post_ID) {
    global $wpdb;

    if (!wp_is_post_revision($post_ID)) {
        add_post_meta($post_ID, 'likes_count', '0', true);
    }
}
add_action('publish_page', 'foxtemas_insert_facebook_likes_custom_field');
add_action('publish_post', 'foxtemas_insert_facebook_likes_custom_field');

/**
 * Extrai número de likes do artigo
 * 
 */
function foxtemas_update_facebook_likes($content = '') {
    
    global $wp_query;
    
    $permalink   = get_permalink();
    $idpost      = $wp_query->post->ID;
    $data        = file_get_contents('http://graph.facebook.com/?id='.$permalink);
    $json        = $data;
    $obj         = json_decode($json);
    $like_no     = $obj->{'comments'};
    $meta_values = get_post_meta($idpost, 'likes_count', true);


    if ($like_no == null) {
        $like_no = 0;
    }

    update_post_meta($idpost, 'likes_count', $like_no, false);

    return $content;
}
add_action('the_content', 'foxtemas_update_facebook_likes');