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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 |
|---|---|
| 344 | $this->query_vars['error'] = $error; |
| 345 | |
| 346 | /** |
| 347 | * Filter the array of parsed query variables. |
| 348 | * |
| 349 | * @since 2.1.0 |
| 350 | * |
| 351 | * @param array $query_vars The array of requested query variables. |
| 352 | */ |
| 353 | $this->query_vars = apply_filters( 'request', $this->query_vars ); |
| 354 | |
| 355 | /** |
| 356 | * Fires once all query variables for the current request have been parsed. |
| 357 | * |
| 358 | * @since 2.1.0 |
| 359 | * |
| 360 | * @param WP &$this Current WordPress environment instance (passed by reference). |
| 361 | */ |
| 362 | do_action_ref_array( 'parse_request', array( &$this ) ); |