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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 |
|---|---|
| 414 | $this->query_string .= (strlen($this->query_string) < 1) ? '' : '&'; |
| 415 | if ( !is_scalar($this->query_vars[$wpvar]) ) // Discard non-scalars. |
| 416 | continue; |
| 417 | $this->query_string .= $wpvar . '=' . rawurlencode($this->query_vars[$wpvar]); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | // query_string filter deprecated. Use request filter instead. |
| 422 | if ( has_filter('query_string') ) { // Don't bother filtering and parsing if no plugins are hooked in. |
| 423 | $this->query_string = apply_filters('query_string', $this->query_string); |
| 424 | parse_str($this->query_string, $this->query_vars); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | /** |
| 429 | * Set up the WordPress Globals. |
| 430 | * |
| 431 | * The query_vars property will be extracted to the GLOBALS. So care should |
| 432 | * be taken when naming global variables that might interfere with the |