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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 |
|---|---|
| 464 | * Filter the canonical redirect URL. |
| 465 | * |
| 466 | * Returning false to this filter will cancel the redirect. |
| 467 | * |
| 468 | * @since 2.3.0 |
| 469 | * |
| 470 | * @param string $redirect_url The redirect URL. |
| 471 | * @param string $requested_url The requested URL. |
| 472 | */ |
| 473 | $redirect_url = apply_filters( 'redirect_canonical', $redirect_url, $requested_url ); |
| 474 | |
| 475 | if ( !$redirect_url || $redirect_url == $requested_url ) // yes, again -- in case the filter aborted the request |
| 476 | return false; |
| 477 | |
| 478 | if ( $do_redirect ) { |
| 479 | // protect against chained redirects |
| 480 | if ( !redirect_canonical($redirect_url, false) ) { |
| 481 | wp_redirect($redirect_url, 301); |
| 482 | exit(); |