3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = 'foo'; $bar = new stdClass; $bar->$foo = array(); $bar->$foo[0] = 42; var_dump($bar);
Output for 7.0.6 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(stdClass)#1 (1) { ["foo"]=> array(1) { [0]=> int(42) } }
Output for 5.5.35 - 5.5.38, 5.6.21 - 5.6.28
object(stdClass)#1 (2) { ["foo"]=> array(0) { } ["f"]=> int(42) }
preferences:
135.51 ms | 402 KiB | 167 Q