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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 |
|---|---|
| 1028 | * |
| 1029 | * @param string $transient Transient name. Expected to not be SQL-escaped. |
| 1030 | * @param mixed $value Transient value. Expected to not be SQL-escaped. |
| 1031 | * @param int $expiration Time until expiration in seconds, default 0 |
| 1032 | * @return bool False if value was not set and true if value was set. |
| 1033 | */ |
| 1034 | function set_site_transient( $transient, $value, $expiration = 0 ) { |
| 1035 | global $_wp_using_ext_object_cache; |
| 1036 | |
| 1037 | $value = apply_filters( 'pre_set_site_transient_' . $transient, $value ); |
| 1038 | |
| 1039 | if ( $_wp_using_ext_object_cache ) { |
| 1040 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
| 1041 | } else { |
| 1042 | $transient_timeout = '_site_transient_timeout_' . $transient; |
| 1043 | $transient = '_site_transient_' . $transient; |
| 1044 | if ( false === get_site_option( $transient ) ) { |
| 1045 | if ( $expiration ) |
| 1046 | add_site_option( $transient_timeout, time() + $expiration ); |