fixed bug #55267 - session_regenerate_id fails after header sent even if session.use_cookies = 0

NEWS

@@ -10,6 +10,9 @@ PHP                                                                        NEWS
   . Fixed bug#52013 (Unable to decompress files in a compressed phar). (Hannes)
   . Fixed bug#53872 (internal corruption of phar). (Hannes)
 
+- Session:
+  . Fixed bug #55267 (session_regenerate_id fails after header sent). (Hannes)
+
 - NSAPI SAPI:
   . Don't set $_SERVER['HTTPS'] on unsecure connection (bug #55403). (Uwe
     Schindler)

ext/session/session.c

@@ -1742,7 +1742,7 @@ static PHP_FUNCTION(session_regenerate_id)
 		return;
 	}
 
-	if (SG(headers_sent)) {
+	if (SG(headers_sent) && PS(use_cookies)) {
 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Cannot regenerate session id - headers already sent");
 		RETURN_FALSE;
 	}