UidGenerator Class

Uid.php

<?php

namespace LMammino\Generator;

class Uid
{
    /**
     * @var string
     */
    protected $salt;

    /**
     * @param string $salt
     */
    public function __construct($salt)
    {
        $this->salt = $salt;
    }

    /**
     * Generates an uid of the given length
     *
     * @param int $len
     * @return string
     */
    public function generate($len=8)
    {
        $hex = md5($this->salt . uniqid());

        $pack = pack('H*', $hex);
        $tmp =  base64_encode($pack);

        $uid = preg_replace("#(*UTF8)[^A-Za-z0-9]#", "", $tmp);

        $len = max(4, min(128, $len));

        while (strlen($uid) < $len) {
            $uid .= $this->generate(22);
        }

        return substr($uid, 0, $len);
    }
}