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Prevent redirection if query string is unchanged #865

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Prevent redirection if query string is unchanged #865

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28 changes: 22 additions & 6 deletions src/wp-includes/canonical.php
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Original file line number Diff line number Diff line change
Expand Up @@ -541,13 +541,29 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
unset( $_parsed_query['name'] );
}
}

/**
* Confirm the old and new query strings are genuinely different before updating the redirect URL.
*
* This prevents caching plugins like Batcache from creating cached redirect loops when processing
* the query string.
*
* https://core.trac.wordpress.org/ticket/41712
*/
parse_str( $original['query'], $_parsed_original_query );
ksort( $_parsed_original_query );
ksort( $_parsed_query );

if ( $_parsed_query !== $_parsed_original_query ) {
$_parsed_query = array_combine(
rawurlencode_deep( array_keys( $_parsed_query ) ),
rawurlencode_deep( array_values( $_parsed_query ) )
);

$_parsed_query = array_combine(
rawurlencode_deep( array_keys( $_parsed_query ) ),
rawurlencode_deep( array_values( $_parsed_query ) )
);

$redirect_url = add_query_arg( $_parsed_query, $redirect_url );
$redirect_url = add_query_arg( $_parsed_query, $redirect_url );
} else {
$redirect_url .= '?' . $original['query'];
}
}

if ( $redirect_url ) {
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