3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x=new stdClass;$x->prop = "foo";$y = $x; $x = null; var_dump($y); $x=new stdClass;$x->prop = "foo";$y = &$x; $x = null; var_dump($y);
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.3.27, 8.4.1 - 8.4.14
object(stdClass)#1 (1) { ["prop"]=> string(3) "foo" } NULL
preferences:
86.95 ms | 408 KiB | 5 Q