Internal server error” error message when a user tries to access your Apache or Lighttpd based dynamic php application

enerally, to solve this problem we need to take help of log files located at following location:
=> /var/log/message
=> /var/log/httpd/error_logs (/var/log/lighttpd/error_log or /var/log/httpd/error_log)

This error only occurs because of web server software. However after looking through logs you may not find many details. This problem may be caused by:

A malformed php cgi script, An invalid directive in an .htaccess or other config file, Limitation imposed by file system and server software (for example php log file size set to 10Mb), Missing php.ini (or cannot read php.ini file)