random string

[robsgaming]

I need to be able to generate a random string that is 7 characters long and includes 0-9, a-z, and A-Z. It must be random EVERY time and be no more than 7 characters. Any ideas? Thanks.

[mrhappiness]

echo substr(md5(microtime()), 0, 7);

but you will have no A-Z only 0-9 and a-z

[lazzerous]

$alpha_num = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','0','1','2','3','4','5','6','7','8','9');

$alpha_num_size = sizeof($alpha_num);

$pass_length = '7';

$password = "";

for ($i=0; $i<$pass_length; $i++)
    {
    $random_number = rand(1, $alpha_num_size);
    $password .= $alpha_num[$random_number];
    }

[LordShryku]

Ooh! Ooh! My turn!

function randomString($length=7) {
   mt_srand((double)microtime()*10000);
   $string = "";
   for($i=0;$i<$length;$i++) {
       $rand    = mt_rand(1,3);
       $string .= (($rand==1)?chr(mt_rand(48,57)):(($rand==2)?chr(mt_rand(65,90)):chr(mt_rand(97,122))));
   }
   return $string;
}

echo randomString();