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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 |
|---|---|
| 1634 | * |
| 1635 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1636 | * |
| 1637 | * @since 4.4.0 |
| 1638 | * |
| 1639 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 1640 | * @param mixed $value New value of site transient. |
| 1641 | * @param string $transient Transient name. |
| 1642 | */ |
| 1643 | $expiration = apply_filters( 'expiration_of_site_transient_' . $transient, $expiration, $value, $transient ); |
| 1644 | |
| 1645 | if ( wp_using_ext_object_cache() ) { |
| 1646 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1647 | } else { |
| 1648 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1649 | $option = '_site_transient_' . $transient; |
| 1650 | if ( false === get_site_option( $option ) ) { |
| 1651 | if ( $expiration ) |
| 1652 | add_site_option( $transient_timeout, time() + $expiration ); |