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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 |
|---|---|
| 630 | /** |
| 631 | * Filter a specific transient before its value is set. |
| 632 | * |
| 633 | * The dynamic portion of the hook name, $transient, refers to the transient name. |
| 634 | * |
| 635 | * @since 3.0.0 |
| 636 | * |
| 637 | * @param mixed $value New value of transient. |
| 638 | */ |
| 639 | $value = apply_filters( 'pre_set_transient_' . $transient, $value ); |
| 640 | |
| 641 | $expiration = (int) $expiration; |
| 642 | |
| 643 | if ( wp_using_ext_object_cache() ) { |
| 644 | $result = wp_cache_set( $transient, $value, 'transient', $expiration ); |
| 645 | } else { |
| 646 | $transient_timeout = '_transient_timeout_' . $transient; |
| 647 | $transient = '_transient_' . $transient; |
| 648 | if ( false === get_option( $transient ) ) { |