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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 |
---|---|
603 | * Passing a truthy value to the filter will effectively short-circuit retrieval |
604 | * of the transient, returning the passed value instead. |
605 | * |
606 | * @since 2.8.0 |
607 | * |
608 | * @param mixed $pre_transient The default value to return if the transient does not exist. |
609 | * Any value other than false will short-circuit the retrieval |
610 | * of the transient, and return the returned value. |
611 | */ |
612 | $pre = apply_filters( 'pre_transient_' . $transient, false ); |
613 | if ( false !== $pre ) |
614 | return $pre; |
615 |
|
616 | if ( wp_using_ext_object_cache() ) { |
617 | $value = wp_cache_get( $transient, 'transient' ); |
618 | } else { |
619 | $transient_option = '_transient_' . $transient; |
620 | if ( ! defined( 'WP_INSTALLING' ) ) { |
621 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |