Menu Adam R Brown

WP hooks navigation: Home/browseActions indexFilters index

Source View: postmeta_form_limit

To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).

Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
662      if ( null === $keys ) {
663           /**
664            * Filters the number of custom fields to retrieve for the drop-down
665            * in the Custom Fields meta box.
666            *
667            * @since 2.1.0
668            *
669            * @param int $limit Number of custom fields to retrieve. Default 30.
670            */
671           $limit = apply_filters( 'postmeta_form_limit', 30 );
672           $sql   = "SELECT DISTINCT meta_key
673                FROM $wpdb->postmeta
674                WHERE meta_key NOT BETWEEN '_' AND '_z'
675                HAVING meta_key NOT LIKE %s
676                ORDER BY meta_key
677                LIMIT %d";
678           $keys  = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) );
679      }
680