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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 |
|---|---|
| 315 | $this->query_vars['error'] = $error; |
| 316 | |
| 317 | /** |
| 318 | * Filter the array of parsed query variables. |
| 319 | * |
| 320 | * @since 2.1.0 |
| 321 | * |
| 322 | * @param array $query_vars The array of requested query variables. |
| 323 | */ |
| 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 ) ); |