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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 |
|---|---|
| 700 | if ( null === $keys ) { |
| 701 | /** |
| 702 | * Filters the number of custom fields to retrieve for the drop-down |
| 703 | * in the Custom Fields meta box. |
| 704 | * |
| 705 | * @since 2.1.0 |
| 706 | * |
| 707 | * @param int $limit Number of custom fields to retrieve. Default 30. |
| 708 | */ |
| 709 | $limit = apply_filters( 'postmeta_form_limit', 30 ); |
| 710 | |
| 711 | $keys = $wpdb->get_col( |
| 712 | $wpdb->prepare( |
| 713 | "SELECT DISTINCT meta_key |
| 714 | FROM $wpdb->postmeta |
| 715 | WHERE meta_key NOT BETWEEN '_' AND '_z' |
| 716 | HAVING meta_key NOT LIKE %s |
| 717 | ORDER BY meta_key |
| 718 | LIMIT %d", |