Fixed regression: Using more than one sign is now OK again when using modify()

Author: derickr

NEWS

@@ -5,6 +5,8 @@ PHP                                                                        NEWS
 - Date:
   . Fixed bug GH-15582: Crash when not calling parent constructor of
     DateTimeZone. (Derick)
+  . Fixed regression where signs after the first one were ignored while parsing
+    a signed integer, with the DateTimeInterface::modify() function. (Derick)
 
 - SOAP:
   . Fixed bug #62900 (Wrong namespace on xsd import error message). (nielsdos)

ext/date/tests/bug40861.phpt

@@ -28,6 +28,6 @@ echo $result . "\n";
 ?>
 --EXPECT--
 2000-01-01 13:00:00
-2000-01-01 13:00:00
 2000-01-01 11:00:00
 2000-01-01 13:00:00
+2000-01-01 13:00:00