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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 |
|---|---|
| 1821 | * |
| 1822 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1823 | * |
| 1824 | * @since 4.4.0 |
| 1825 | * |
| 1826 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 1827 | * @param mixed $value New value of site transient. |
| 1828 | * @param string $transient Transient name. |
| 1829 | */ |
| 1830 | $expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient ); |
| 1831 | |
| 1832 | if ( wp_using_ext_object_cache() ) { |
| 1833 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1834 | } else { |
| 1835 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1836 | $option = '_site_transient_' . $transient; |
| 1837 | if ( false === get_site_option( $option ) ) { |
| 1838 | if ( $expiration ) { |
| 1839 | add_site_option( $transient_timeout, time() + $expiration ); |