Add the test case for GH-9296

Author: DrDet

ext/standard/tests/array/gh9296.phpt

@@ -0,0 +1,17 @@
+--TEST--
+GH-9296: incorrect ksort(..., SORT_REGULAR) behaviour on arrays with numeric and string keys
+--FILE--
+<?php
+$array = ["aaa" => 0, 600 => 1];
+ksort($array, SORT_REGULAR);
+var_dump($array);
+var_dump(array_key_first($array) <=> array_key_last($array));
+?>
+--EXPECT--
+array(2) {
+  [600]=>
+  int(1)
+  ["aaa"]=>
+  int(0)
+}
+int(-1)