Add PHP support for std::unique_ptr and std::auto_ptr

Equivalent to Python/Ruby implementations.

Lib/php/std_auto_ptr.i

@@ -0,0 +1,35 @@
+/* -----------------------------------------------------------------------------
+ * std_auto_ptr.i
+ *
+ * SWIG library file for handling std::auto_ptr.
+ * Memory ownership is passed from the std::auto_ptr C++ layer to the proxy
+ * class when returning a std::auto_ptr from a function.
+ * Memory ownership is passed from the proxy class to the std::auto_ptr in the
+ * C++ layer when passed as a parameter to a wrapped function.
+ * ----------------------------------------------------------------------------- */
+
+%define %auto_ptr(TYPE)
+%typemap(in, noblock=1) std::auto_ptr< TYPE > (void *argp = 0, int res = 0) {
+  res = SWIG_ConvertPtr(&$input, &argp, $descriptor(TYPE *), SWIG_POINTER_RELEASE);
+  if (!SWIG_IsOK(res)) {
+    if (res == SWIG_ERROR_RELEASE_NOT_OWNED) {
+      zend_type_error("Cannot release ownership as memory is not owned for argument $argnum of type 'TYPE *' of $symname");
+      return;
+    } else {
+      zend_type_error("Expected TYPE * for argument $argnum of $symname");
+      return;
+    }
+  }
+  $1.reset((TYPE *)argp);
+}
+
+%typemap (out) std::auto_ptr< TYPE > %{
+  SWIG_SetPointerZval($result, (void *)$1.release(), $descriptor(TYPE *), SWIG_POINTER_OWN);
+%}
+
+%template() std::auto_ptr< TYPE >;
+%enddef
+
+namespace std {
+  template <class T> class auto_ptr {};
+}