title: Running the same script at the same time and PHP's single-threaded status
body: <p>I know PHP is single-threaded, so I am wondering, does this mean if I run say <code>foo.php</code> in a browser tab and then open another browser tab and run the same file, will it still run if <code>foo.php</code> is still running in the other browser tab!?</p>
  
  <p>If not, how can you run the same script at once? Do you just rename the script something else and then you can run both at the same time? ...or am I getting confused here?</p>