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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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346 |
|
347 | if ( ($client_last_modified && $client_etag) ? |
348 | (($client_modified_timestamp >= $wp_modified_timestamp) && ($client_etag == $wp_etag)) : |
349 | (($client_modified_timestamp >= $wp_modified_timestamp) || ($client_etag == $wp_etag)) ) { |
350 | status_header( 304 ); |
351 | exit; |
352 | } |
353 | } |
354 |
|
355 | do_action_ref_array('send_headers', array(&$this)); |
356 | } |
357 |
|
358 | /** |
359 | * Sets the query string property based off of the query variable property. |
360 | * |
361 | * The 'query_string' filter is deprecated, but still works. Plugins should |
362 | * use the 'request' filter instead. |
363 | * |
364 | * @since 2.0.0 |