fix integration tests not running in uwsgi-2.0 branch

Makefile

@@ -22,3 +22,5 @@ tests:
 
 %:
 	$(PYTHON) uwsgiconfig.py --build $@
+
+.PHONY: all clean check tests

t/php/test.php

@@ -0,0 +1,23 @@
+<?php
+
+# execute with:
+# uwsgi --ini t/php/config.ini &
+# curl http://localhost:8080/test.php
+
+set_error_handler(function() {
+	var_export(func_get_args());
+	echo "\nFAIL\n";
+	die;
+});
+
+session_start();
+$_SESSION['t'] = 't';
+session_commit();
+
+session_start();
+session_regenerate_id();
+session_commit();
+
+session_start();
+session_destroy();
+echo "PASS\n";