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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 |
---|---|
994 | * Any value other than false will "short-circuit" the retrieval of the transient |
995 | * and return the returned value. |
996 | * @uses apply_filters() Calls 'site_transient_$option' hook, after checking the transient, with |
997 | * the transient value. |
998 | * |
999 | * @param string $transient Transient name. Expected to not be SQL-escaped. |
1000 | * @return mixed Value of transient |
1001 | */ |
1002 | function get_site_transient( $transient ) { |
1003 | $pre = apply_filters( 'pre_site_transient_' . $transient, false ); |
1004 | if ( false !== $pre ) |
1005 | return $pre; |
1006 |
|
1007 | if ( wp_using_ext_object_cache() ) { |
1008 | $value = wp_cache_get( $transient, 'site-transient' ); |
1009 | } else { |
1010 | // Core transients that do not have a timeout. Listed here so querying timeouts can be avoided. |
1011 | $no_timeout = array('update_core', 'update_plugins', 'update_themes'); |
1012 | $transient_option = '_site_transient_' . $transient; |