add failing test for string_replace and array replaces with references

```
make test TESTS=ext/standard/tests/strings/str_replace_*.phpt
```

diff --git a/ext/standard/tests/strings/str_replace_array_refs.phpt b/ext/standard/tests/strings/str_replace_array_refs.phpt
new file mode 100644 (file)
index 0000000..102bcfa
--- /dev/null
+++ b/ext/standard/tests/strings/str_replace_array_refs.phpt
@@ -0,0 +1,17 @@
+--TEST--
+Test str_replace() function and array refs
+--INI--
+precision=14
+--FILE--
+<?php
+$data = ['a' => 'b', 'numeric' => 1];
+$ref = &$data;
+$b = &$ref['a'];
+$numeric = &$ref['numeric'];
+var_dump(str_replace(array_keys($data), $data, "a numeric"));
+var_dump($numeric);
+var_dump($data['numeric']);
+--EXPECTF--
+string(3) "b 1"
+int(1)
+int(1)