http://123.206.87.240:8002/get/index1.php

题解：

$num=$_GET['num'];
if(!is_numeric($num))
{
echo $num;
if($num==1)
echo 'flag{**********}';
}

num既不能是数字字符，但是要等于1

URL

http://123.206.87.240:8002/get/index1.php?num=1*e*0.1
http://123.206.87.240:8002/get/index1.php?num=1*1
http://123.206.87.240:8002/get/index1.php?num=1!
http://123.206.87.240:8002/get/index1.php?num=1-2