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run code in 300+ PHP versions simultaneously
<?php phpversion() >= "7.0.0" or die(); class FooBar { private $x; public function __construct() { var_dump($this); echo "Let's remove a property!", PHP_EOL; unset($this->x); var_dump($this); print_r($this); echo "Let's add a property!", PHP_EOL; $this->x = 2; var_dump($this); echo "Where did the private come from?", PHP_EOL; } } $foobar = new Foobar;

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