3v4l.org

run code in 300+ PHP versions simultaneously
<?php function a() { $b = &$c[0]; var_dump(get_defined_vars()); $c[0] = 1; var_dump(get_defined_vars()); $c = [1]; var_dump(get_defined_vars()); } a();
Output for 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(2) { ["b"]=> &NULL ["c"]=> array(1) { [0]=> &NULL } } array(2) { ["b"]=> &int(1) ["c"]=> array(1) { [0]=> &int(1) } } array(2) { ["b"]=> int(1) ["c"]=> array(1) { [0]=> int(1) } }
preferences:
109.79 ms | 1667 KiB | 4 Q