Add test for display_error_function_args

If this is not enabled by default for tests (like the fatal error
backtrace RFC), then at least test for it.

Author: NattyNarwhal

Zend/tests/display_error_function_args.phpt

@@ -0,0 +1,28 @@
+--TEST--
+Displaying function arguments in errors
+--INI--
+display_error_function_args=On
+--FILE--
+<?php
+
+// A function that sets its own parameters in docref call, to compare
+unlink('/');
+// Something with sensitive parameters that exists in a minimal build,
+// and also doesn't set anything in the docref call
+// XXX: May be better to provide a new zend_test func?
+password_hash("test", PASSWORD_BCRYPT, array("salt" => "123456789012345678901" . chr(0)));
+
+ini_set("display_error_function_args", "Off");
+
+unlink('/');
+password_hash("test", PASSWORD_BCRYPT, array("salt" => "123456789012345678901" . chr(0)));
+
+?>
+--EXPECTF--
+Warning: unlink('/'): %s in %s on line %d
+
+Warning: password_hash(Object(SensitiveParameterValue), '2y', Array): The "salt" option has been ignored, since providing a custom salt is no longer supported in %s on line %d
+
+Warning: unlink(/): %s in %s on line %d
+
+Warning: password_hash(): The "salt" option has been ignored, since providing a custom salt is no longer supported in %s on line %d