[PHP] Add support for PHP7.

PHP5's C extension API has changed substantially so you need to use
-php7 to specify you want PHP7 compatible wrappers.
Fixes https://github.com/swig/swig/issues/571

Examples/test-suite/php5/director_finalizer_runme.php

@@ -0,0 +1,61 @@
+<?php
+
+require "tests.php";
+require "director_finalizer.php";
+
+// No new functions
+check::functions(array(foo_orstatus,deletefoo,getstatus,launder,resetstatus));
+// No new classes
+check::classes(array(director_finalizer,Foo));
+// now new vars
+check::globals(array());
+
+class MyFoo extends Foo {
+  function __destruct() {
+    $this->orStatus(2);
+    if (method_exists(parent, "__destruct")) {
+      parent::__destruct();
+    }
+  }
+}
+
+resetStatus();
+
+$a = new MyFoo();
+unset($a);
+
+check::equal(getStatus(), 3, "getStatus() failed #1");
+
+resetStatus();
+
+$a = new MyFoo();
+launder($a);
+
+check::equal(getStatus(), 0, "getStatus() failed #2");
+
+unset($a);
+
+check::equal(getStatus(), 3, "getStatus() failed #3");
+
+resetStatus();
+
+$a = new MyFoo();
+$a->thisown = 0;
+deleteFoo($a);
+unset($a);
+
+check::equal(getStatus(), 3, "getStatus() failed #4");
+
+resetStatus();
+
+$a = new MyFoo();
+$a->thisown = 0;
+deleteFoo(launder($a));
+unset($a);
+
+check::equal(getStatus(), 3, "getStatus() failed #5");
+
+resetStatus();
+
+check::done();
+?>