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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 |
|---|---|
| 744 | * Filters the canonical redirect URL. |
| 745 | * |
| 746 | * Returning false to this filter will cancel the redirect. |
| 747 | * |
| 748 | * @since 2.3.0 |
| 749 | * |
| 750 | * @param string $redirect_url The redirect URL. |
| 751 | * @param string $requested_url The requested URL. |
| 752 | */ |
| 753 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
| 754 | |
| 755 | // Yes, again -- in case the filter aborted the request. |
| 756 | if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) === strip_fragment_from_url( $requested_url ) ) { |
| 757 | return; |
| 758 | } |
| 759 | |
| 760 | if ( $do_redirect ) { |
| 761 | // Protect against chained redirects. |
| 762 | if ( ! redirect_canonical( $redirect_url, false ) ) { |