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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 |
|---|---|
| 2366 | * |
| 2367 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 2368 | * |
| 2369 | * @since 4.4.0 |
| 2370 | * |
| 2371 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 2372 | * @param mixed $value New value of site transient. |
| 2373 | * @param string $transient Transient name. |
| 2374 | */ |
| 2375 | $expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient ); |
| 2376 | |
| 2377 | if ( wp_using_ext_object_cache() || wp_installing() ) { |
| 2378 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 2379 | } else { |
| 2380 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 2381 | $option = '_site_transient_' . $transient; |
| 2382 | |
| 2383 | if ( false === get_site_option( $option ) ) { |
| 2384 | if ( $expiration ) { |