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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 |
|---|---|
| 2601 | * |
| 2602 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 2603 | * |
| 2604 | * @since 3.0.0 |
| 2605 | * @since 4.4.0 The `$transient` parameter was added. |
| 2606 | * |
| 2607 | * @param mixed $value New value of site transient. |
| 2608 | * @param string $transient Transient name. |
| 2609 | */ |
| 2610 | $value = apply_filters( "pre_set_site_transient_{$transient}", $value, $transient ); |
| 2611 | |
| 2612 | $expiration = (int) $expiration; |
| 2613 | |
| 2614 | /** |
| 2615 | * Filters the expiration for a site transient before its value is set. |
| 2616 | * |
| 2617 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 2618 | * |
| 2619 | * @since 4.4.0 |