3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { public $state = 1; } class B { public $a; public function __construct() { $this->a = $GLOBALS['a']; } } $GLOBALS['a'] = new A(); $b = new B(); echo $b->a->state . PHP_EOL; $GLOBALS['a']->state++; echo $b->a->state . PHP_EOL; $GLOBALS['a'] = new A(); echo $b->a->state . PHP_EOL;
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
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preferences:
94.9 ms | 408 KiB | 5 Q