How can I create a unique random string in laravel

Question

Shown below is my attempt to the problem

private function generate_app_code($application_id) { 
        $token = $this->getToken(6, $application_id);
        $code = 'EN'. $token . substr(strftime("%Y", time()),2);

        return $code;
    }

    private function getToken($length, $seed){    
        $token = "";
        $codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        $codeAlphabet.= "0123456789";

        mt_srand($seed);      // Call once. Good since $application_id is unique.

        for($i=0;$i<$length;$i++){
            $token .= $codeAlphabet[mt_rand(0,strlen($codeAlphabet)-1)];
        }
        return $token;
    }

Can the code above do the trick?

Answer 1

Hello @kartik,

You can use :

sha1(time())

Explanation: sha1 is hash function, and most important characteristic of hash function is that they never produce the same hash of different string, so as time() is always unique in theory sha1(time()) will always give you unique string with fixed width.

Hope it helps!!
Thank you!!