[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/arrays_scope_runme.php

@@ -0,0 +1,16 @@
+<?php
+
+require "tests.php";
+require "arrays_scope.php";
+
+// New functions
+check::functions(array(new_bar,bar_blah));
+// New classes
+check::classes(array(arrays_scope,Bar));
+// New vars
+check::globals(array(bar_adata,bar_bdata,bar_cdata));
+
+$bar=new bar();
+
+check::done();
+?>