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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 |
|---|---|
| 780 | * Filters the canonical redirect URL. |
| 781 | * |
| 782 | * Returning false to this filter will cancel the redirect. |
| 783 | * |
| 784 | * @since 2.3.0 |
| 785 | * |
| 786 | * @param string $redirect_url The redirect URL. |
| 787 | * @param string $requested_url The requested URL. |
| 788 | */ |
| 789 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
| 790 | |
| 791 | // Yes, again -- in case the filter aborted the request. |
| 792 | if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) === strip_fragment_from_url( $requested_url ) ) { |
| 793 | return; |
| 794 | } |
| 795 | |
| 796 | if ( $do_redirect ) { |
| 797 | // Protect against chained redirects. |
| 798 | if ( ! redirect_canonical( $redirect_url, false ) ) { |