--TEST--

Deprecate using null as array offset

--FILE--

$arr = ['foo' => 'bar', '' => 'baz'];

echo $arr[null] . "\n";

$arr[null] = 'new_value';

echo $arr[''] . "\n";

var_dump(isset($arr[null]));

unset($arr[null]);

var_dump(isset($arr['']));

--EXPECTF--

Deprecated: Using null as an array offset is deprecated, use an empty string instead in %s on line %d

baz

Deprecated: Using null as an array offset is deprecated, use an empty string instead in %s on line %d

new_value

Deprecated: Using null as an array offset is deprecated, use an empty string instead in %s on line %d

bool(true)

bool(false)