3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array( 'a' => array('w','c','v','f'), 'b' => 'v' ); echo json_encode($arr);
Output for 5.6.0 - 5.6.40, 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
{"a":["w","c","v","f"],"b":"v"}
preferences:
218.8 ms | 403 KiB | 291 Q