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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 |
---|---|
567 | /** |
568 | * Fires immediately before a specific transient is deleted. |
569 | * |
570 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
571 | * |
572 | * @since 3.0.0 |
573 | * |
574 | * @param string $transient Transient name. |
575 | */ |
576 | do_action( "delete_transient_{$transient}", $transient ); |
577 |
|
578 | if ( wp_using_ext_object_cache() ) { |
579 | $result = wp_cache_delete( $transient, 'transient' ); |
580 | } else { |
581 | $option_timeout = '_transient_timeout_' . $transient; |
582 | $option = '_transient_' . $transient; |
583 | $result = delete_option( $option ); |
584 | if ( $result ) |
585 | delete_option( $option_timeout ); |