function genPass($size) 

{ 

$letter = 'qwertyuipasdfghjklzxcvbnm'; 

$letter .= strtoupper($letter); 

$letter .= '123456789'; 

     

mt_srand((double)microtime()*1000000); 

$pass = ""; 

for ($i = 0; $i < $size; $i++) 

$pass .= $letter[mt_rand(0, strlen($letter)-1)]; 

return $pass; 

} 

?>