如何知道我的主机php5在suphp下运行

Question

how to know my php5 is running under suphp?

Answer 1

If you don't have the POSIX extension installed (it's not common on shared hosting), one option is going to be creating a new file and then checking the uid/gid it's created with:

file_put_contents('./tmp.txt', 'Stuff!');
echo "File UID is: ", 
     fileowner('./tmp.txt'), 
     ', GID is: ',
     filegroup('./tmp.txt');

Now, the numbers alone might not be useful, but they can serve as guidelines.

If the UID is 99, the user PHP is running as is nobody, which means no suPHP. If the UID is 33, that could be user www-data, which again means no suPHP.

If the UID is just a few over 9000 500 or 1000, then there is a small chance that you're under suPHP. If it's way over 500 or 1000, then you may well be under suPHP.

You might be able to actually read /etc/passwd and examine the UIDs there, but that's rude.

However, your best bet might be checking phpinfo. suPHP might leave clues that it's running, or there might be other environment variables that you can take a peek at. For example, Apache's mod_php can not possibly be suPHP, so if you see that PHP is running as mod_php, you certainly aren't suPHP'd.