<?PHP
function createRandomStr($length){ 
	$str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62个字符 
	$strlen = 62; 
	while($length > $strlen){ 
	$str .= $str; 
	$strlen += 62; 
	} 
	$str = str_shuffle($str); 
	return substr($str,$length); 
} 
//生成十个随机字符
echo createRandomStr(10); 

/*** 以上代码来自 jb51.cc ***/ 
?>