Revert "Merge from PHP-5.4"

This reverts commit 9a87fe1.

Author: laruence

Zend/zend_builtin_functions.c

@@ -1488,42 +1488,41 @@ ZEND_FUNCTION(set_exception_handler)
 {
 	zval *exception_handler;
 	char *exception_handler_name = NULL;
+	zend_bool had_orig_exception_handler=0;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "z", &exception_handler) == FAILURE) {
 		return;
 	}
 
 	if (Z_TYPE_P(exception_handler) != IS_NULL) { /* NULL == unset */
-		zend_bool had_orig_exception_handler = 0;
-
 		if (!zend_is_callable(exception_handler, 0, &exception_handler_name TSRMLS_CC)) {
 			zend_error(E_WARNING, "%s() expects the argument (%s) to be a valid callback",
-					get_active_function_name(TSRMLS_C), exception_handler_name?exception_handler_name:"unknown");
+					   get_active_function_name(TSRMLS_C), exception_handler_name?exception_handler_name:"unknown");
 			efree(exception_handler_name);
 			return;
 		}
 		efree(exception_handler_name);
+	}
 
-		if (EG(user_exception_handler)) {
-			had_orig_exception_handler = 1;
-			*return_value = *EG(user_exception_handler);
-			zval_copy_ctor(return_value);
-			zend_ptr_stack_push(&EG(user_exception_handlers), EG(user_exception_handler));
-		}
-
-		ALLOC_ZVAL(EG(user_exception_handler));
-		MAKE_COPY_ZVAL(&exception_handler, EG(user_exception_handler));
+	if (EG(user_exception_handler)) {
+		had_orig_exception_handler = 1;
+		*return_value = *EG(user_exception_handler);
+		zval_copy_ctor(return_value);
+		zend_ptr_stack_push(&EG(user_exception_handlers), EG(user_exception_handler));
+	}
+	ALLOC_ZVAL(EG(user_exception_handler));
 
-		if (!had_orig_exception_handler) {
-			RETURN_NULL();
-		}
-	} else {
-		if (EG(user_exception_handler)) {
-			zend_ptr_stack_push(&EG(user_exception_handlers), EG(user_exception_handler));
-		}
+	if (Z_TYPE_P(exception_handler) == IS_NULL) { /* unset user-defined handler */
+		FREE_ZVAL(EG(user_exception_handler));
 		EG(user_exception_handler) = NULL;
 		RETURN_TRUE;
 	}
+
+	MAKE_COPY_ZVAL(&exception_handler, EG(user_exception_handler))
+
+	if (!had_orig_exception_handler) {
+		RETURN_NULL();
+	}
 }
 /* }}} */