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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 |
|---|---|
| 217 | |
| 218 | if ( ($client_last_modified && $client_etag) ? |
| 219 | (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) : |
| 220 | (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) { |
| 221 | status_header( 304 ); |
| 222 | exit; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | do_action_ref_array('send_headers', array(&$this)); |
| 227 | } |
| 228 | |
| 229 | function build_query_string() { |
| 230 | $this->query_string = ''; |
| 231 | foreach (array_keys($this->query_vars) as $wpvar) { |
| 232 | if ( '' != $this->query_vars[$wpvar] ) { |
| 233 | $this->query_string .= (strlen($this->query_string) < 1) ? '' : '&'; |
| 234 | if ( !is_scalar($this->query_vars[$wpvar]) ) // Discard non-scalars. |
| 235 | continue; |