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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 |
|---|---|
| 536 | // Old-style action. |
| 537 | if ( 'post' === $meta_type ) { |
| 538 | /** |
| 539 | * Fires immediately after deleting metadata for a post. |
| 540 | * |
| 541 | * @since 2.9.0 |
| 542 | * |
| 543 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 544 | */ |
| 545 | do_action( 'deleted_postmeta', $meta_ids ); |
| 546 | } |
| 547 | |
| 548 | return true; |
| 549 | } |
| 550 | |
| 551 | /** |
| 552 | * Retrieves the value of a metadata field for the specified object type and ID. |
| 553 | * |
| 554 | * If the meta field exists, a single value is returned if `$single` is true, |