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Source View: nocache_headers

To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).

Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

Line Code
1690 function wp_get_nocache_headers() {
1691      $headers = array(
1692           'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
1693           'Last-Modified' => gmdate( 'D, d M Y H:i:s' ) . ' GMT',
1694           'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
1695           'Pragma' => 'no-cache',
1696      );
1697
1698      if ( function_exists('apply_filters') ) {
1699           $headers = (array) apply_filters('nocache_headers', $headers);
1700      }
1701      return $headers;
1702 }
1703
1704 /**
1705  * Sets the headers to prevent caching for the different browsers.
1706  *
1707  * Different browsers support different nocache headers, so several headers must
1708  * be sent so that all of them get the point that no caching should occur.