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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 |
|---|---|
| 1612 | * |
| 1613 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1614 | * |
| 1615 | * @since 3.0.0 |
| 1616 | * @since 4.4.0 The `$transient` parameter was added. |
| 1617 | * |
| 1618 | * @param mixed $value New value of site transient. |
| 1619 | * @param string $transient Transient name. |
| 1620 | */ |
| 1621 | $value = apply_filters( 'pre_set_site_transient_' . $transient, $value, $transient ); |
| 1622 | |
| 1623 | $expiration = (int) $expiration; |
| 1624 | |
| 1625 | /** |
| 1626 | * Filter the expiration for a site transient before its value is set. |
| 1627 | * |
| 1628 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1629 | * |
| 1630 | * @since 4.4.0 |