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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 |
|---|---|
| 364 | $this->query_vars = apply_filters( 'request', $this->query_vars ); |
| 365 | |
| 366 | /** |
| 367 | * Fires once all query variables for the current request have been parsed. |
| 368 | * |
| 369 | * @since 2.1.0 |
| 370 | * |
| 371 | * @param WP $this Current WordPress environment instance (passed by reference). |
| 372 | */ |
| 373 | do_action_ref_array( 'parse_request', array( &$this ) ); |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Sends additional HTTP headers for caching, content type, etc. |
| 378 | * |
| 379 | * Sets the Content-Type header. Sets the 'error' status (if passed) and optionally exits. |
| 380 | * If showing a feed, it will also send Last-Modified, ETag, and 304 status if needed. |
| 381 | * |
| 382 | * @since 2.0.0 |