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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 |
---|---|
567 | * Filters the canonical redirect URL. |
568 | * |
569 | * Returning false to this filter will cancel the redirect. |
570 | * |
571 | * @since 2.3.0 |
572 | * |
573 | * @param string $redirect_url The redirect URL. |
574 | * @param string $requested_url The requested URL. |
575 | */ |
576 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
577 |
|
578 | // yes, again -- in case the filter aborted the request |
579 | if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) == strip_fragment_from_url( $requested_url ) ) { |
580 | return; |
581 | } |
582 |
|
583 | if ( $do_redirect ) { |
584 | // protect against chained redirects |
585 | if ( ! redirect_canonical( $redirect_url, false ) ) { |