Add FFI example to tests

Author: Girgias

ext/standard/tests/array/array_sum_objects_operation_no_cast_FFI.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Test array_sum() function with objects that implement addition but not castable to numeric type
+--EXTENSIONS--
+ffi
+--FILE--
+<?php
+
+$x = FFI::new("int[2]");
+$x[0] = 10;
+$x[1] = 25;
+
+$input = [$x, 1];
+
+echo "array_sum() version:\n";
+var_dump(array_sum($input));
+
+echo "array_reduce() version:\n";
+var_dump(array_reduce($input, fn($carry, $value) => $carry + $value, 0));
+?>
+--EXPECTF--
+array_sum() version:
+
+Warning: Object of class FFI\CData could not be converted to int|float in %s on line %d
+int(0)
+array_reduce() version:
+object(FFI\CData:int32_t*)#4 (1) {
+  [0]=>
+  int(25)
+}