<?php

/**
 * warnings:
 * 1. PHP Warning: Undefined property: stdClass::$nullable in /tmp/main.php on line 11
 * 2. PHP Warning: Undefined array key "nullable" in /tmp/main.php on line 16
 * 3. PHP Warning: Undefined property: GetProperty::$nullable in /tmp/main.php on line 25
 */

$std = new stdClass();
$std->nullable;

# =====

$arr = [];
$arr['nullable'];

# =====

final class GetProperty
{
}

$property = new GetProperty();
$property->nullable;