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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 |
|---|---|
| 298 | elseif ( isset($GLOBALS[$var]) && '' != $GLOBALS[$var] ) |
| 299 | $this->query_vars[$var] = $GLOBALS[$var]; |
| 300 | } |
| 301 | |
| 302 | if ( isset($error) ) |
| 303 | $this->query_vars['error'] = $error; |
| 304 | |
| 305 | $this->query_vars = apply_filters('request', $this->query_vars); |
| 306 | |
| 307 | do_action_ref_array('parse_request', array(&$this)); |
| 308 | } |
| 309 | |
| 310 | /** |
| 311 | * Send additional HTTP headers for caching, content type, etc. |
| 312 | * |
| 313 | * Sets the X-Pingback header, 404 status (if 404), Content-type. If showing |
| 314 | * a feed, it will also send last-modified, etag, and 304 status if needed. |
| 315 | * |
| 316 | * @since 2.0.0 |