3v4l.org

run code in 300+ PHP versions simultaneously
<?php $o = new stdClass(); $b = 'a'; $o->a = array ( 'foo' => 1, 'bar' => 2 ); var_dump($o->$b['foo']); var_dump($o);
Output for 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(1) object(stdClass)#1 (1) { ["a"]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: Illegal string offset 'foo' in /in/p3H4s on line 10 array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } object(stdClass)#1 (1) { ["a"]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } object(stdClass)#1 (1) { ["a"]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } object(stdClass)(1) { ["a"]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } }

preferences:
306.73 ms | 402 KiB | 460 Q