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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 |
|---|---|
| 390 | $this->query_vars = apply_filters( 'request', $this->query_vars ); |
| 391 | |
| 392 | /** |
| 393 | * Fires once all query variables for the current request have been parsed. |
| 394 | * |
| 395 | * @since 2.1.0 |
| 396 | * |
| 397 | * @param WP $wp Current WordPress environment instance (passed by reference). |
| 398 | */ |
| 399 | do_action_ref_array( 'parse_request', array( &$this ) ); |
| 400 | |
| 401 | return true; |
| 402 | } |
| 403 | |
| 404 | /** |
| 405 | * Sends additional HTTP headers for caching, content type, etc. |
| 406 | * |
| 407 | * Sets the Content-Type header. Sets the 'error' status (if passed) and optionally exits. |
| 408 | * If showing a feed, it will also send Last-Modified, ETag, and 304 status if needed. |