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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 |
|---|---|
| 324 | $this->query_vars = apply_filters( 'request', $this->query_vars ); |
| 325 | |
| 326 | /** |
| 327 | * Fires once all query variables for the current request have been parsed. |
| 328 | * |
| 329 | * @since 2.1.0 |
| 330 | * |
| 331 | * @param WP &$this Current WordPress environment instance (passed by reference). |
| 332 | */ |
| 333 | do_action_ref_array( 'parse_request', array( &$this ) ); |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Send additional HTTP headers for caching, content type, etc. |
| 338 | * |
| 339 | * Sets the X-Pingback header, 404 status (if 404), Content-type. If showing |
| 340 | * a feed, it will also send last-modified, etag, and 304 status if needed. |
| 341 | * |
| 342 | * @since 2.0.0 |