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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 |
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360 |
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361 | if ( ($client_last_modified && $client_etag) ? |
362 | (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) : |
363 | (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) { |
364 | $status = 304; |
365 | $exit_required = true; |
366 | } |
367 | } |
368 |
|
369 | $headers = apply_filters('wp_headers', $headers, $this); |
370 |
|
371 | if ( ! empty( $status ) ) |
372 | status_header( $status ); |
373 |
|
374 | // If Last-Modified is set to false, it should not be sent (no-cache situation). |
375 | if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) { |
376 | unset( $headers['Last-Modified'] ); |
377 |
|
378 | // In PHP 5.3+, make sure we are not sending a Last-Modified header. |