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