Tests: chdir() and open() for PHP module.

These tests ensure optimizations in the chdir calls don't break
SAPI semantics.

test/unit/applications/lang/php.py

@@ -4,7 +4,7 @@ from unit.applications.proto import TestApplicationProto
 class TestApplicationPHP(TestApplicationProto):
     application_type = "php"
 
-    def load(self, script, name='index.php', **kwargs):
+    def load(self, script, index='index.php', **kwargs):
         script_path = self.current_dir + '/php/' + script
 
         self._load_conf(
@@ -16,7 +16,7 @@ class TestApplicationPHP(TestApplicationProto):
                         "processes": {"spare": 0},
                         "root": script_path,
                         "working_directory": script_path,
-                        "index": name,
+                        "index": index,
                     }
                 },
             },