3v4l.org

run code in 300+ PHP versions simultaneously
<?php arr = {"a"=>"\u4e3a\u4e86\u786e\u4fdd\u592a\u5b50\u7684"} echo json_encode(arr); ?>
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28
Parse error: syntax error, unexpected '=' in /in/K8PJu on line 2
Process exited with code 255.
preferences:
192.24 ms | 1395 KiB | 65 Q