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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 |
|---|---|
| 368 | |
| 369 | if ( ($client_last_modified && $client_etag) ? |
| 370 | (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) : |
| 371 | (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) { |
| 372 | $status = 304; |
| 373 | $exit_required = true; |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | $headers = apply_filters('wp_headers', $headers, $this); |
| 378 | |
| 379 | if ( ! empty( $status ) ) |
| 380 | status_header( $status ); |
| 381 | foreach( (array) $headers as $name => $field_value ) |
| 382 | @header("{$name}: {$field_value}"); |
| 383 | |
| 384 | if ( isset( $headers['Last-Modified'] ) && empty( $headers['Last-Modified'] ) && function_exists( 'header_remove' ) ) |
| 385 | @header_remove( 'Last-Modified' ); |
| 386 | |