3v4l.org

run code in 300+ PHP versions simultaneously
<?php //Source: https://bugs.php.net/bug.php?id=63898 $key = "Foo " . chr(163); $array = array($key => ""); print_r($array); $json = json_encode($array); echo $json."\n"; var_dump(json_decode($json), json_last_error(), json_last_error_msg());
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [Foo �] => ) NULL int(4) string(12) "Syntax error"
Output for 5.6.0 - 5.6.40
Array ( [Foo �] => ) NULL int(0) string(8) "No error"
preferences:
113.96 ms | 407 KiB | 5 Q