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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 |
|---|---|
| 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 | |
| 387 | if ( $exit_required ) |
| 388 | exit(); |
| 389 | |
| 390 | do_action_ref_array('send_headers', array(&$this)); |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * Sets the query string property based off of the query variable property. |
| 395 | * |
| 396 | * The 'query_string' filter is deprecated, but still works. Plugins should |
| 397 | * use the 'request' filter instead. |
| 398 | * |
| 399 | * @since 2.0.0 |