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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 |
|---|---|
| 349 | |
| 350 | if ( ($client_last_modified && $client_etag) ? |
| 351 | (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) : |
| 352 | (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) { |
| 353 | $status = 304; |
| 354 | $exit_required = true; |
| 355 | } |
| 356 | } |
| 357 | |
| 358 | $headers = apply_filters('wp_headers', $headers, $this); |
| 359 | |
| 360 | if ( ! empty( $status ) ) |
| 361 | status_header( $status ); |
| 362 | foreach( (array) $headers as $name => $field_value ) |
| 363 | @header("{$name}: {$field_value}"); |
| 364 | |
| 365 | if ($exit_required) |
| 366 | exit(); |
| 367 | |