WP hooks navigation: Home/browse • Actions index • Filters index
To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 614 | if ( null === $keys ) { |
| 615 | /** |
| 616 | * Filters the number of custom fields to retrieve for the drop-down |
| 617 | * in the Custom Fields meta box. |
| 618 | * |
| 619 | * @since 2.1.0 |
| 620 | * |
| 621 | * @param int $limit Number of custom fields to retrieve. Default 30. |
| 622 | */ |
| 623 | $limit = apply_filters( 'postmeta_form_limit', 30 ); |
| 624 | $sql = "SELECT DISTINCT meta_key |
| 625 | FROM $wpdb->postmeta |
| 626 | WHERE meta_key NOT BETWEEN '_' AND '_z' |
| 627 | HAVING meta_key NOT LIKE %s |
| 628 | ORDER BY meta_key |
| 629 | LIMIT %d"; |
| 630 | $keys = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) ); |
| 631 | } |
| 632 | |