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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 |
---|---|
651 | * |
652 | * Returning a non-null value will effectively short-circuit and avoid a |
653 | * potentially expensive query against postmeta. |
654 | * |
655 | * @since 4.4.0 |
656 | * |
657 | * @param array|null $keys Pre-defined meta keys to be used in place of a postmeta query. Default null. |
658 | * @param WP_Post $post The current post object. |
659 | */ |
660 | $keys = apply_filters( 'postmeta_form_keys', null, $post ); |
661 |
|
662 | if ( null === $keys ) { |
663 | /** |
664 | * Filters the number of custom fields to retrieve for the drop-down |
665 | * in the Custom Fields meta box. |
666 | * |
667 | * @since 2.1.0 |
668 | * |
669 | * @param int $limit Number of custom fields to retrieve. Default 30. |