Sometimes, when opening a Magento product page, the following error is shown:

Parse error: syntax error, unexpected ‘endif’ (T_ENDIF) in …

The problem here is not with the Magento code itself. Its a problem with the Apache server configuration. To solve it, open php.ini and look for short_open_tag. The value here should be On and not Off. So, to solve the problem, change the value to On, save the file and restart the Apache server.