3v4l.org

run code in 300+ PHP versions simultaneously
<?php class X { public $bar = 1; function __construct($a) { $this->bar = $a; } } function foo1(&$test) { $test = new X(12); } function foo2($test){ $test = new X(12); } $n = new X(0); foo2($n); var_dump($n); foo1($n); var_dump($n);
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(X)#1 (1) { ["bar"]=> int(0) } object(X)#2 (1) { ["bar"]=> int(12) }
preferences:
152 ms | 408 KiB | 5 Q