所以在模板中。php原始函数如下所示：

    function meta_form() {
        global $wpdb;
        $limit = (int) apply_filters( \'postmeta_form_limit\', 30 );
        $keys = $wpdb->get_col( "
            SELECT meta_key
            FROM $wpdb->postmeta
            GROUP BY meta_key
            HAVING meta_key NOT LIKE \'\\_%\'
            ORDER BY meta_key
            LIMIT $limit" );
        if ( $keys )
            natcasesort($keys);

与此同时，我办公室的某个人将其更改为：

    function meta_form() {
        global $wpdb;

      if ( isset($_GET[\'post\']) )
        $post_id = (int) $_GET[\'post\'];
      elseif ( isset($_POST[\'post_ID\']) )
        $post_id = (int) $_POST[\'post_ID\'];
      else
        $post_id = 0;

      if ( $post_id ) {
        $post_ = get_post($post_id);

      }

      if ($post_->post_type == \'video_photo\' ){
        $limit = (int) apply_filters( \'postmeta_form_limit\', 30 );
        $keys = $wpdb->get_col( "
            SELECT meta_key
            FROM $wpdb->postmeta
        where meta_key like \'tqmcf_%\'
            GROUP BY meta_key
            HAVING meta_key NOT LIKE \'\\_%\'
            ORDER BY meta_key
            LIMIT $limit" );
      }else{
        $limit = (int) apply_filters( \'postmeta_form_limit\', 30 );
        $keys = $wpdb->get_col( "
            SELECT meta_key
            FROM $wpdb->postmeta

            GROUP BY meta_key
            HAVING meta_key NOT LIKE \'\\_%\'
            ORDER BY meta_key
            LIMIT $limit" );
      }

        if ( $keys )
            natcasesort($keys);

我一直在做研究，看来对核心的任何更改都应该在我的主题功能中完成。php文件使用add\\u filter或add\\u action。走这条路对吗？我该怎么做？我仍然不太了解它们是如何工作的。

提前感谢您的帮助。

add_action( \'admin_footer\', \'so17239871_mod_metakeyselect\' );
function so17239871_mod_metakeyselect()
{
    global $pagenow, $post_type;

    if( ! ( \'post.php\' == $pagenow && \'video_photo\' == $post_type ) )
        return;
?>
<script type="text/javascript">
jQuery(document).ready(function(){
    jQuery("#metakeyselect > option").hide();
    jQuery("#metakeyselect > option[value^=\'tqmcf_\']").show();
});
</script>
<?php
}