My php scripts do not log in or displays error message

Hello someone can help me,
Cpanel used and changed to a week to CWP.
All my scripts using login and password when I try to get it returns to login and does not display any error, what setting should I change to solve this problem?

If u speak about default syntax php errors, change the configuration of default php.ini. (Admin Panel ->Php Settings -> Edit PHP.ini Configuration)  :

display_errors On
error_reporting E_ALL

At the end of file.