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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 |
|---|---|
| 1668 | * |
| 1669 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1670 | * |
| 1671 | * @since 4.4.0 |
| 1672 | * |
| 1673 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 1674 | * @param mixed $value New value of site transient. |
| 1675 | * @param string $transient Transient name. |
| 1676 | */ |
| 1677 | $expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient ); |
| 1678 | |
| 1679 | if ( wp_using_ext_object_cache() ) { |
| 1680 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1681 | } else { |
| 1682 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1683 | $option = '_site_transient_' . $transient; |
| 1684 | if ( false === get_site_option( $option ) ) { |
| 1685 | if ( $expiration ) |
| 1686 | add_site_option( $transient_timeout, time() + $expiration ); |