3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { public $foo; public function __get($name) { echo "__get\n"; $this->{$name} = 'foo'; return $this->{$name}; } } $foo = new foo(); var_dump(empty($foo->foo)); var_dump($foo->foo); var_dump(empty($foo->foo));

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