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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 |
|---|---|
| 978 | * |
| 979 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
| 980 | * |
| 981 | * @since 4.4.0 |
| 982 | * |
| 983 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
| 984 | * @param mixed $value New value of transient. |
| 985 | * @param string $transient Transient name. |
| 986 | */ |
| 987 | $expiration = apply_filters( "expiration_of_transient_{$transient}", $expiration, $value, $transient ); |
| 988 | |
| 989 | if ( wp_using_ext_object_cache() || wp_installing() ) { |
| 990 | $result = wp_cache_set( $transient, $value, 'transient', $expiration ); |
| 991 | } else { |
| 992 | $transient_timeout = '_transient_timeout_' . $transient; |
| 993 | $transient_option = '_transient_' . $transient; |
| 994 | |
| 995 | if ( false === get_option( $transient_option ) ) { |
| 996 | $autoload = 'yes'; |