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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 |
|---|---|
| 593 | * |
| 594 | * Returning a non-null value will effectively short-circuit and avoid a |
| 595 | * potentially expensive query against postmeta. |
| 596 | * |
| 597 | * @since 4.4.0 |
| 598 | * |
| 599 | * @param array|null $keys Pre-defined meta keys to be used in place of a postmeta query. Default null. |
| 600 | * @param WP_Post $post The current post object. |
| 601 | */ |
| 602 | $keys = apply_filters( 'postmeta_form_keys', null, $post ); |
| 603 | |
| 604 | if ( null === $keys ) { |
| 605 | /** |
| 606 | * Filters the number of custom fields to retrieve for the drop-down |
| 607 | * in the Custom Fields meta box. |
| 608 | * |
| 609 | * @since 2.1.0 |
| 610 | * |
| 611 | * @param int $limit Number of custom fields to retrieve. Default 30. |