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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 |
|---|---|
| 621 | /** |
| 622 | * Fires immediately before a specific transient is deleted. |
| 623 | * |
| 624 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 625 | * |
| 626 | * @since 3.0.0 |
| 627 | * |
| 628 | * @param string $transient Transient name. |
| 629 | */ |
| 630 | do_action( "delete_transient_{$transient}", $transient ); |
| 631 | |
| 632 | if ( wp_using_ext_object_cache() ) { |
| 633 | $result = wp_cache_delete( $transient, 'transient' ); |
| 634 | } else { |
| 635 | $option_timeout = '_transient_timeout_' . $transient; |
| 636 | $option = '_transient_' . $transient; |
| 637 | $result = delete_option( $option ); |
| 638 | if ( $result ) { |
| 639 | delete_option( $option_timeout ); |