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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 |
|---|---|
| 549 | /** |
| 550 | * Fires immediately before a specific transient is deleted. |
| 551 | * |
| 552 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 553 | * |
| 554 | * @since 3.0.0 |
| 555 | * |
| 556 | * @param string $transient Transient name. |
| 557 | */ |
| 558 | do_action( 'delete_transient_' . $transient, $transient ); |
| 559 | |
| 560 | if ( wp_using_ext_object_cache() ) { |
| 561 | $result = wp_cache_delete( $transient, 'transient' ); |
| 562 | } else { |
| 563 | $option_timeout = '_transient_timeout_' . $transient; |
| 564 | $option = '_transient_' . $transient; |
| 565 | $result = delete_option( $option ); |
| 566 | if ( $result ) |
| 567 | delete_option( $option_timeout ); |