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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 |
|---|---|
| 626 | |
| 627 | /** |
| 628 | * Filter the number of custom fields to retrieve for the drop-down |
| 629 | * in the Custom Fields meta box. |
| 630 | * |
| 631 | * @since 2.1.0 |
| 632 | * |
| 633 | * @param int $limit Number of custom fields to retrieve. Default 30. |
| 634 | */ |
| 635 | $limit = apply_filters( 'postmeta_form_limit', 30 ); |
| 636 | $sql = "SELECT meta_key |
| 637 | FROM $wpdb->postmeta |
| 638 | GROUP BY meta_key |
| 639 | HAVING meta_key NOT LIKE %s |
| 640 | ORDER BY meta_key |
| 641 | LIMIT %d"; |
| 642 | $keys = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) ); |
| 643 | if ( $keys ) { |
| 644 | natcasesort( $keys ); |