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[root@VM_0_14_centos ~]# php just-for-fun-ai/ai.php

Fatal error: Uncaught Error: Call to undefined function readline() in /root/just-for-fun-ai/ai.php:34
Stack trace:
#0 {main}
  thrown in /root/just-for-fun-ai/ai.php on line 34
[root@VM_0_14_centos ~]# php -v
PHP 7.2.3 (cli) (built: Nov 28 2018 12:05:00) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
[root@VM_0_14_centos ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)