<pre>
<?php
/**
 * get_client_connects() Function
 * Created by: Joshua H. (TRUSTAbyss)
 *
 * Usage: get_client_connects(PORT) will output an integer value
 * based on the number of connections to the server. This function
 * accepts an optional IP argument that can be used to show how
 * many connections a single client has made.
 *
 * Note: The number of connections is based on the server's timeout;
 * if you're server has a timeout of 15, a client connection will remain
 * active until 15 seconds of inactivity.
 *
 * This function requires access to the exec() function and netstat
 * command in order for it to work.
 */
 
function get_client_connects($port, $ip = '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
{
    $connects = 0; // Initialize the $connects variable.
 
    // Run the netstat command and output the contents to an array.
    exec("netstat -n", $array);
 
    // Create the pattern that will be used to match the number of clients connected.
    $pattern = "([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}[.:]{$port}[ ]+{$ip}[.:][0-9]+)[ ]+ESTABLISHED";
 
    foreach ($array as $string) // Loop through the array.
    {
        if (preg_match("/$pattern/i", $string)) 
        {
            $connects++; // Increase the number of connects by one.
        }
    }
 
    // Output the number of connections made.
    return $connects;
}
 
// Lets display the number of connections from the current user on port 80.
echo get_client_connects(80, $_SERVER['REMOTE_ADDR']).' Connection(s) From '.$_SERVER['REMOTE_ADDR']."\n";
 
// Lets display all connections on port 80!
echo get_client_connects(80).' Connection(s) From Total';
?>
</pre>