3v4l.org

run code in 300+ PHP versions simultaneously
<?php $someJson = '{"hello":{"how":"alal","hey":"who"}}'; var_dump(json_encode($someJson));
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(48) ""{\"hello\":{\"how\":\"alal\",\"hey\":\"who\"}}""

preferences:
263.35 ms | 404 KiB | 335 Q