fix #36878 (error messages are printed even though an exception has been thrown)

Author: tony2001

NEWS

@@ -11,6 +11,8 @@ PHP                                                                        NEWS
 - Removed the E_STRICT deprecation notice from "var". (Ilia)
 - Fixed debug_zval_dump() to support private and protected members. (Dmitry)
 - Fixed SoapFault::getMessage(). (Dmitry)
+- Fixed bug #36878 (error messages are printed even though an exception has 
+  been thrown). (Tony)
 - Fixed bug #36869 (memory leak in output buffering when using chunked output).
   (Tony)
 - Fixed bug #36859 (DOMElement crashes when calling __construct when 

Zend/zend.c

@@ -1025,7 +1025,7 @@ ZEND_API void zend_error(int type, const char *format, ...)
 					}
 					zval_ptr_dtor(&retval);
 				}
-			} else {
+			} else if (!EG(exception)) {
 				/* The user error handler failed, use built-in error handler */
 				zend_error_cb(type, error_filename, error_lineno, format, args);
 			}