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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 |
---|---|
1995 | * |
1996 | * The dynamic portion of the hook name, `$transient`, refers to the transient name. |
1997 | * |
1998 | * @since 4.4.0 |
1999 | * |
2000 | * @param int $expiration Time until expiration in seconds. Use 0 for no expiration. |
2001 | * @param mixed $value New value of site transient. |
2002 | * @param string $transient Transient name. |
2003 | */ |
2004 | $expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient ); |
2005 |
|
2006 | if ( wp_using_ext_object_cache() ) { |
2007 | $result = wp_cache_set( $transient, $value, 'site-transient', $expiration ); |
2008 | } else { |
2009 | $transient_timeout = '_site_transient_timeout_' . $transient; |
2010 | $option = '_site_transient_' . $transient; |
2011 |
|
2012 | if ( false === get_site_option( $option ) ) { |
2013 | if ( $expiration ) { |