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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 |
|---|---|
| 514 | * Filters the canonical redirect URL. |
| 515 | * |
| 516 | * Returning false to this filter will cancel the redirect. |
| 517 | * |
| 518 | * @since 2.3.0 |
| 519 | * |
| 520 | * @param string $redirect_url The redirect URL. |
| 521 | * @param string $requested_url The requested URL. |
| 522 | */ |
| 523 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
| 524 | |
| 525 | // yes, again -- in case the filter aborted the request |
| 526 | if ( ! $redirect_url || strip_fragment_from_url( $redirect_url ) == strip_fragment_from_url( $requested_url ) ) { |
| 527 | return; |
| 528 | } |
| 529 | |
| 530 | if ( $do_redirect ) { |
| 531 | // protect against chained redirects |
| 532 | if ( !redirect_canonical($redirect_url, false) ) { |