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run code in 300+ PHP versions simultaneously
<?php class ob { private $b = false; public function __construct($b=false) { if ($b) $this->b = $b; } public function toString(){ return $b; } } $ob = new ob(); var_dump($ob); $ob2 = new ob(true); var_dump($ob2);

preferences:
52.36 ms | 402 KiB | 5 Q