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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 |
|---|---|
| 487 | // Old-style action. |
| 488 | if ( 'post' === $meta_type ) { |
| 489 | /** |
| 490 | * Fires immediately before deleting metadata for a post. |
| 491 | * |
| 492 | * @since 2.9.0 |
| 493 | * |
| 494 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 495 | */ |
| 496 | do_action( 'delete_postmeta', $meta_ids ); |
| 497 | } |
| 498 | |
| 499 | $query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . ' )'; |
| 500 | |
| 501 | $count = $wpdb->query( $query ); |
| 502 | |
| 503 | if ( ! $count ) { |
| 504 | return false; |
| 505 | } |