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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 |
|---|---|
| 1498 | * |
| 1499 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 1500 | * |
| 1501 | * @since 4.4.0 |
| 1502 | * |
| 1503 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 1504 | * @param mixed $value New value of transient. |
| 1505 | * @param string $transient Transient name. |
| 1506 | */ |
| 1507 | $expiration = apply_filters( "expiration_of_transient_{$transient}", $expiration, $value, $transient ); |
| 1508 | |
| 1509 | if ( wp_using_ext_object_cache() || wp_installing() ) { |
| 1510 | $result = wp_cache_set( $transient, $value, 'transient', $expiration ); |
| 1511 | } else { |
| 1512 | $transient_timeout = '_transient_timeout_' . $transient; |
| 1513 | $transient_option = '_transient_' . $transient; |
| 1514 | wp_prime_option_caches( array( $transient_option, $transient_timeout ) ); |
| 1515 | |
| 1516 | if ( false === get_option( $transient_option ) ) { |