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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 |
---|---|
689 | * |
690 | * Returning a non-null value will effectively short-circuit and avoid a |
691 | * potentially expensive query against postmeta. |
692 | * |
693 | * @since 4.4.0 |
694 | * |
695 | * @param array|null $keys Pre-defined meta keys to be used in place of a postmeta query. Default null. |
696 | * @param WP_Post $post The current post object. |
697 | */ |
698 | $keys = apply_filters( 'postmeta_form_keys', null, $post ); |
699 |
|
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. |