If your application requires the PHP safe_mode directive to be set to 'Off' then you can disable safe_mode from within Plesk.
If you are installing to a subdomain, unfortunately you cannot disable safe_mode just for that subdomain. You can disable it for your primary domain and it will affect the subdomain as well. Follow these directions to accomplish this.
- Login to Plesk
- Choose Domains in the upper left hand corner and choose the domain to which you are installing the application
- Choose "Web Hosting Settings" or on older Plesk versions "Setup" under the Hosting header
- In the list of services at the bottom of the page will be PHP.
- To the right of the option to enable/disable PHP will be a checkbox that will allow you to disable safe_mode.
If you would like to check to verify that safe_mode is disabled, create a file in the web-accessible directory in question called phpinfo.php and place the following within.
<?php phpinfo(); ?>
Then access that page in your browser. The page will list all the php variables, including the safe_mode variable.