Find Free Port with PHP

portfinder.md

Find Free Port with PHP

This is a quick way to find a random free port on a system using PHP:

$port = find_free_port();

Benchmarked locally, where finding a port always took around 0.15ms.

portfinder.php

<?php

/**
 * Find a free port on the system
 *
 * @return int
 */
function find_free_port()
{
    $sock = socket_create_listen(0); 
    socket_getsockname($sock, $addr, $port); 
    socket_close($sock);

    return $port;
}

thanks!