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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 |
|---|---|
| 1644 | * |
| 1645 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1646 | * |
| 1647 | * @since 3.0.0 |
| 1648 | * @since 4.4.0 The `$transient` parameter was added. |
| 1649 | * |
| 1650 | * @param mixed $value New value of site transient. |
| 1651 | * @param string $transient Transient name. |
| 1652 | */ |
| 1653 | $value = apply_filters( "pre_set_site_transient_{$transient}", $value, $transient ); |
| 1654 | |
| 1655 | $expiration = (int) $expiration; |
| 1656 | |
| 1657 | /** |
| 1658 | * Filters the expiration for a site transient before its value is set. |
| 1659 | * |
| 1660 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1661 | * |
| 1662 | * @since 4.4.0 |