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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 |
|---|---|
| 540 | if ( has_filter( 'query_string' ) ) { // Don't bother filtering and parsing if no plugins are hooked in. |
| 541 | /** |
| 542 | * Filters the query string before parsing. |
| 543 | * |
| 544 | * @since 1.5.0 |
| 545 | * @deprecated 2.1.0 Use 'query_vars' or 'request' filters instead. |
| 546 | * |
| 547 | * @param string $query_string The query string to modify. |
| 548 | */ |
| 549 | $this->query_string = apply_filters( 'query_string', $this->query_string ); |
| 550 | parse_str( $this->query_string, $this->query_vars ); |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | /** |
| 555 | * Set up the WordPress Globals. |
| 556 | * |
| 557 | * The query_vars property will be extracted to the GLOBALS. So care should |
| 558 | * be taken when naming global variables that might interfere with the |