Random password and salt

gistfile1.php

$salt = '';
            $password = '';
            for($i=0;$i < 64;$i++)	{
                $char = '';
                switch(rand(0,3))	{
                    //A-Z
                    case 0:
                        $char = chr(rand(65,90));
                        break;
                    //a-z
                    case 1:
                        $char = chr(rand(97,122));
                        break;
                    //0-9
                    case 2:
                        $char = chr(rand(97,122));
                        break;

                }
                $salt .= $char;
                if(strlen($password) < 8)
                    $password .= $char;
            }