PHP生成多位随机字母数字的代码
<?
function getRandomString($len, $chars=null){
if (is_null($chars)){
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
}
mt_srand(10000000*(double)microtime());
for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i++){
$str .= $chars[mt_rand(0, $lc)];
}
return $str;
}
$rand5=getRandomString(11); //这里的11代表生成11位数
echo $rand5;
?>
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