3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public $prop; public $ref; public function &__get($name) { $this->ref &= $this->prop; return $this->prop; } public function __set($name, $value) { echo "set $name = $value\n"; } } $foo = new Foo; $foo->bar++; var_dump($foo->prop);
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
set bar = 1 NULL

preferences:
79.19 ms | 1440 KiB | 4 Q