임의의 문자열 생성

##########javascript 版############## 

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



##########php版############## 

함수randomChar($len ){ 
if($len<1) return; 
$str=''; 
$ss = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; 
for($i=0;$i<$len;$i++){ 
  $n = rand(0,35); 
  $str .= $ss[$n]; 
} 
$str을 반환합니다. 
}