Hello again mates.
This is what I get when running what you said:
[root@pool-100-0-7-225 ~]# php -v
PHP 5.3.8 (cli) (built: Nov 8 2011 13:54:44)
Copyright (c) 1997-2011 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
[root@pool-100-0-7-225 ~]#
[root@pool-100-0-7-225 ~]# php -l /path/to/web/index.php
No syntax errors detected in /path/to/web/index.php
[root@pool-100-0-7-225 ~]#
[root@pool-100-0-7-225 web]# php -l index.php
No syntax errors detected in index.php
[root@pool-100-0-7-225 web]#
The CLI is installed, and no syntax error is detected. Anyway, it worked in production and no error was raised.