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Source View: postmeta_form_limit

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Source View

Line Code
682      if ( null === $keys ) {
683           /**
684            * Filters the number of custom fields to retrieve for the drop-down
685            * in the Custom Fields meta box.
686            *
687            * @since 2.1.0
688            *
689            * @param int $limit Number of custom fields to retrieve. Default 30.
690            */
691           $limit = apply_filters( 'postmeta_form_limit', 30 );
692
693           $keys = $wpdb->get_col(
694                $wpdb->prepare(
695                     "SELECT DISTINCT meta_key
696                     FROM $wpdb->postmeta
697                     WHERE meta_key NOT BETWEEN '_' AND '_z'
698                     HAVING meta_key NOT LIKE %s
699                     ORDER BY meta_key
700                     LIMIT %d",