php生成随机字符串,
$length 可以定义生成的字符串长度
public static function getRandomStr($length)
{
$str = null;
$strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
$max = strlen($strPol) - 1;
for ($i = 0;
$i < $length;
$i++) {
$str .= $strPol[rand(0, $max)];
}
return $str;
}
