How fast is php_uname()?

How fast is php_uname() say doing php_uname('s n') or php_uname('a'). The reason I ask is because I'd like to use it to determine which server I'm on and therefore the configuration (paths, etc).

This is related to Is there a PHP function or variable giving the local host name?

From stackoverflow Darryl Hein

• I just did this:

  <?php
    $tstart = microtime(true);
  
    php_uname('a');
  
    print 'it took '. sprintf("%f",microtime(true) - $tstart) ." seconds\n";
  ?>
  

  And it produced this:

  it took 0.000016 seconds
  

  That is on a Core2Duo 2.4GHz Debian box.

  I know it is an empirical test and all but I think that it shows that it will be fast enough for you.

  I did not expect it to take a long time since uname only needs to make a very simple call to the kernel.

  eyelidlessness : I don't know. The user's never gonna get that 0.000016 seconds back.
  From Adam Pierce

• $_SERVER['HTTP_HOST']
  

  From Steve