Create Unique AlphaNumeric

function MakeUnique($length=16) {
           $salt       = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
           $len        = strlen($salt);
           $makepass   = '';
           for ($i = 0; $i < $length; $i++) {
               $makepass .= $salt[mt_rand(0,$len - 1)];
       return $makepass;


  1. Swadesh Ranjan Dash

    You can change the value of $bytes for more than 8 character.
    Example:- if you set $bytes = 2 then the o/p character 4.

    $bytes  =  4;
    $cstrong   =  true;
    $uid       =  bin2hex(openssl_random_pseudo_bytes($bytes, $cstrong));

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