<?php
srand(); //behövs ej i nyare php-versioner
$rnd_str = "";
for ($i=0;$i<10;$i++)
{
if (mt_rand(1,3) == 1)
$rnd_str = $rnd_str.chr(mt_rand(97,122)); //gemener
else if (mt_rand(1,3) == 2)
$rnd_str = $rnd_str.chr(mt_rand(65,90)); //versaler
else
$rnd_str = $rnd_str.chr(mt_rand(48,57)); //siffror
}
$_SESSION['chal'] = $rnd_str; //Spara strängen i sessionvariabeln
?>
Edit:
I see it now