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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 |
|---|---|
| 997 | * Any value other than false will "short-circuit" the retrieval of the transient |
| 998 | * and return the returned value. |
| 999 | * @uses apply_filters() Calls 'site_transient_$option' hook, after checking the transient, with |
| 1000 | * the transient value. |
| 1001 | * |
| 1002 | * @param string $transient Transient name. Expected to not be SQL-escaped. |
| 1003 | * @return mixed Value of transient |
| 1004 | */ |
| 1005 | function get_site_transient( $transient ) { |
| 1006 | $pre = apply_filters( 'pre_site_transient_' . $transient, false ); |
| 1007 | if ( false !== $pre ) |
| 1008 | return $pre; |
| 1009 | |
| 1010 | if ( wp_using_ext_object_cache() ) { |
| 1011 | $value = wp_cache_get( $transient, 'site-transient' ); |
| 1012 | } else { |
| 1013 | // Core transients that do not have a timeout. Listed here so querying timeouts can be avoided. |
| 1014 | $no_timeout = array('update_core', 'update_plugins', 'update_themes'); |
| 1015 | $transient_option = '_site_transient_' . $transient; |