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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 |
|---|---|
| 687 | * |
| 688 | * @since 3.0.0 |
| 689 | * @since 4.2.0 The `$expiration` parameter was added. |
| 690 | * @since 4.4.0 The `$transient` parameter was added. |
| 691 | * |
| 692 | * @param mixed $value New value of transient. |
| 693 | * @param int $expiration Time until expiration in seconds. |
| 694 | * @param string $transient Transient name. |
| 695 | */ |
| 696 | $value = apply_filters( 'pre_set_transient_' . $transient, $value, $expiration, $transient ); |
| 697 | |
| 698 | /** |
| 699 | * Filter the expiration for a transient before its value is set. |
| 700 | * |
| 701 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 702 | * |
| 703 | * @since 4.4.0 |
| 704 | * |
| 705 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |