3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = json_decode('{"a":1,"a":2}'); var_dump(json_last_error_msg()); var_dump($a);
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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(8) "No error" object(stdClass)#1 (1) { ["a"]=> int(2) }
preferences:
90.52 ms | 1946 KiB | 4 Q