產生隨機字串

##########javascript 版############### 

function randomChar(l) {
  var x="123456789poiuytrewqasdfghjkAZbgAZdAZjAZgg; 
  var tmp=""; 
  for(var i=0;i  tmp += x.charAt(Math.ceil(Math.random()*100000000)%x.length); 
  } 
  回傳 tmp； 
} 
var str = randomChar(20); 
document.write(str.toUpperCase()); 



##########php 版############## 

function randomChar($len){ 
if($len$str=''; 
$ss = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; 
for($i=0;$i  $n = rand(0,35); 
  $str .= $ss[$n]; 
} 
return $str; 
}