For the PHP directives there are system values set by default. You can get information about them by calling the phpinfo() function.
By using phpinfo you can view the PHP version, enabled PHP modules/extensions, server information, OS version, paths, HTTP headers and others.
You need to create a file with a .php extension such as sdhrd.php in a directory, accessible through web. Then write the following lines in it:
<?php phpinfo(); ?>
Open the newly created file in your browser.
Depending on where you have located it in your hosting account, write down the full web address to the file.
For example, if it is located in the public_html/dir/ directory, you should access:
replace mysupersite.com with your domain name, dir with the directory name and sdhrd.php with the new file name.