Online PHP editor | output for erB4r

<?php class Base { public static $prop = 'A'; } class Child extends Base { } // both values are A $expected = 'A'; echo "Should be $expected and is " . Base::$prop . "\n"; echo "Should be $expected and is " . Child::$prop . "\n"; // both values are B $expected = 'B'; Base::$prop = $expected; echo "Should be $expected and is " . Base::$prop . "\n"; echo "Should be $expected and is " . Child::$prop . "\n"; // VALUES DIFFER $expected = 'C'; $property = new ReflectionProperty('Base', 'prop'); $property->setValue($expected); echo "Should be $expected and is " . Base::$prop . "\n"; echo "Should be $expected and is " . Child::$prop . "\n"; // VALUES STILL DIFFER $expected = 'D'; Base::$prop = $expected; echo "Should be $expected and is " . Base::$prop . "\n"; echo "Should be $expected and is " . Child::$prop . "\n";