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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 |
|---|---|
| 671 | * |
| 672 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 673 | * |
| 674 | * @since 3.0.0 |
| 675 | * @since 4.2.0 Added `$expiration` parameter. |
| 676 | * |
| 677 | * @param mixed $value New value of transient. |
| 678 | * @param int $expiration Time until expiration in seconds. |
| 679 | */ |
| 680 | $value = apply_filters( 'pre_set_transient_' . $transient, $value, $expiration ); |
| 681 | |
| 682 | if ( wp_using_ext_object_cache() ) { |
| 683 | $result = wp_cache_set( $transient, $value, 'transient', $expiration ); |
| 684 | } else { |
| 685 | $transient_timeout = '_transient_timeout_' . $transient; |
| 686 | $transient = '_transient_' . $transient; |
| 687 | if ( false === get_option( $transient ) ) { |
| 688 | $autoload = 'yes'; |
| 689 | if ( $expiration ) { |