php 获取指定数量随机字符串函数
//获取随机字符串函数
function rands($length){
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$code = '';
for ($i = 0; $i < $length; $i++) {
$code .= $chars[ mt_rand(0, strlen($chars) - 1) ];
}
return $code;
}
//获取7位随机字符
$code = rands(7);