<?php
$info = ""; 
$req = [];
$flag="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
ini_set("display_error", false); //为一个配置选项设置值
error_reporting(0); //关闭所有PHP错误报告
if(!isset($_GET['number'])){
 header("hint:26966dc52e85af40f59b4fe73D8c323a.txt"); //Http头显示hint 26966dc52e85af40f59b4fe73d8c323a.txt
 die("have a fun!!"); //die — 等同于 exit()
}
foreach([$_GET, $_POST] as $global_var) {//foreach 语法结构提供了遍历数组的简单方式 
foreach($global_var as $key => $value) { 
$value = tri&#109;($value);//trim — 去除字符串首尾处的空白字符（或者其他字符）
is_string($value) && $req[$key] = addslashes($value); // is_string — 检测变量是否是字符串，addslashes — 使用反斜线引用字符串
} 
} 
function is_palindrome_number($number) { 
$number = strval($number); //strval — 获取变量的字符串值
$i = 0; 
$j = strlen($number) - 1; //strlen — 获取字符串长度
while($i < $j) { 
if($number[$i] !== $number[$j]) { 
return false; 
} 
$i++; 
$j--; 
} 
return true; 
} 
if(is_numeric($_REQUEST['number'])) //is_numeric — 检测变量是否为数字或数字字符串 
{
 $info="sorry, you cann't input a number!";
}
elseif($req['number']!=strval(intval($req['number']))) //intval — 获取变量的整数值
{
 $info = "number must be equal to it's integer!! ";
}
else
{
 $value1 = intval($req["number"]);
 $value2 = intval(strrev($req["number"]));
 if($value1!=$value2){
$info="no, this is not a palindrome number!";
 }
 else
 {
if(is_palindrome_number($req["number"])){
$info = "nice! {$value1} is a palindrome number!"; 
}
else
{
 $info=$flag;
}
 }
}
echo $info;