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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 |
|---|---|
| 227 | if ( !is_scalar($this->query_vars[$wpvar]) ) // Discard non-scalars. |
| 228 | continue; |
| 229 | $this->query_string .= $wpvar . '=' . rawurlencode($this->query_vars[$wpvar]); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | // query_string filter deprecated. Use request filter instead. |
| 234 | global $wp_filter; |
| 235 | if ( isset($wp_filter['query_string']) ) { // Don't bother filtering and parsing if no plugins are hooked in. |
| 236 | $this->query_string = apply_filters('query_string', $this->query_string); |
| 237 | parse_str($this->query_string, $this->query_vars); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | function register_globals() { |
| 242 | global $wp_query; |
| 243 | // Extract updated query vars back into global namespace. |
| 244 | foreach ($wp_query->query_vars as $key => $value) { |
| 245 | $GLOBALS[$key] = $value; |