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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 |
---|---|
623 | * |
624 | * @since 2.8.0 |
625 | * @since 4.4.0 The `$transient` parameter was added |
626 | * |
627 | * @param mixed $pre_transient The default value to return if the transient does not exist. |
628 | * Any value other than false will short-circuit the retrieval |
629 | * of the transient, and return the returned value. |
630 | * @param string $transient Transient name. |
631 | */ |
632 | $pre = apply_filters( "pre_transient_{$transient}", false, $transient ); |
633 | if ( false !== $pre ) |
634 | return $pre; |
635 |
|
636 | if ( wp_using_ext_object_cache() ) { |
637 | $value = wp_cache_get( $transient, 'transient' ); |
638 | } else { |
639 | $transient_option = '_transient_' . $transient; |
640 | if ( ! wp_installing() ) { |
641 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |