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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 |
|---|---|
| 618 | * |
| 619 | * @since 2.8.0 |
| 620 | * @since 4.4.0 The `$transient` parameter was added |
| 621 | * |
| 622 | * @param mixed $pre_transient The default value to return if the transient does not exist. |
| 623 | * Any value other than false will short-circuit the retrieval |
| 624 | * of the transient, and return the returned value. |
| 625 | * @param string $transient Transient name. |
| 626 | */ |
| 627 | $pre = apply_filters( 'pre_transient_' . $transient, false, $transient ); |
| 628 | if ( false !== $pre ) |
| 629 | return $pre; |
| 630 | |
| 631 | if ( wp_using_ext_object_cache() ) { |
| 632 | $value = wp_cache_get( $transient, 'transient' ); |
| 633 | } else { |
| 634 | $transient_option = '_transient_' . $transient; |
| 635 | if ( ! wp_installing() ) { |
| 636 | // If option is not in alloptions, it is not autoloaded and thus has a timeout |