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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 |
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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 |