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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 |
|---|---|
| 979 | * @uses apply_filters() Calls 'site_transient_$option' hook, after checking the transient, with |
| 980 | * the transient value. |
| 981 | * |
| 982 | * @param string $transient Transient name. Expected to not be SQL-escaped. |
| 983 | * @return mixed Value of transient |
| 984 | */ |
| 985 | function get_site_transient( $transient ) { |
| 986 | global $_wp_using_ext_object_cache; |
| 987 | |
| 988 | $pre = apply_filters( 'pre_site_transient_' . $transient, false ); |
| 989 | if ( false !== $pre ) |
| 990 | return $pre; |
| 991 | |
| 992 | if ( $_wp_using_ext_object_cache ) { |
| 993 | $value = wp_cache_get( $transient, 'site-transient' ); |
| 994 | } else { |
| 995 | // Core transients that do not have a timeout. Listed here so querying timeouts can be avoided. |
| 996 | $no_timeout = array('update_core', 'update_plugins', 'update_themes'); |
| 997 | $transient_option = '_site_transient_' . $transient; |