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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 |
|---|---|
| 497 | * Filters the canonical redirect URL. |
| 498 | * |
| 499 | * Returning false to this filter will cancel the redirect. |
| 500 | * |
| 501 | * @since 2.3.0 |
| 502 | * |
| 503 | * @param string $redirect_url The redirect URL. |
| 504 | * @param string $requested_url The requested URL. |
| 505 | */ |
| 506 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
| 507 | |
| 508 | // yes, again -- in case the filter aborted the request |
| 509 | if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) == strip_fragment_from_url( $requested_url ) ) { |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | if ( $do_redirect ) { |
| 514 | // protect against chained redirects |
| 515 | if ( !redirect_canonical($redirect_url, false) ) { |