你真的会PHP吗？——实验吧

<?php$info = ""; $req = [];$flag="xxxxxxxxxx";ini_set("display_error", false); error_reporting(0); if(!isset($_POST[‘number‘])){ ??header("hint:6c525af4059b4fe7d8c33a.txt"); ??die("have a fun!!"); }foreach([$_POST] as $global_var) { ????foreach($global_var as $key => $value) { ????????$value = trim($value); ????????is_string($value) && $req[$key] = addslashes($value); ????} } function is_palindrome_number($number) { ????$number = strval($number); ????$i = 0; ????$j = strlen($number) - 1; ????while($i < $j) { ????????if($number[$i] !== $number[$j]) { ????????????return false; ????????} ????????$i++; ????????$j--; ????} ????return true; } if(is_numeric($_REQUEST[‘number‘])){ ??????$info="sorry, you cann‘t input a number!";}elseif($req[‘number‘]!=strval(intval($req[‘number‘]))){ ??????????$info = "number must be equal to it‘s integer!! "; ?}else{ ????$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;

if(is_numeric($_REQUEST[‘number‘])){ ??????$info="sorry, you cann‘t input a number!";//条件1：输入的不能只是数字 }elseif($req[‘number‘]!=strval(intval($req[‘number‘]))){ ??????????$info = "number must be equal to it‘s integer!! "; ?//条件2：输入的值经过变整型又变成字符型后应该与原来一样 }else{ ?????$value1 = intval($req["number"]); ????$value2 = intval(strrev($req["number"])); ???????if($value1!=$value2){//条件3：输入的值直接变成整型应该和其颠倒之后再变成整型一样 ?????????$info="no, this is not a palindrome number!"; ????}else{ ???????????????????if(is_palindrome_number($req["number"])){//条件4：输入的不能是回文，就是颠倒和原来不能一样 ?????????????$info = "nice! {$value1} is a palindrome number!"; ??????????}else{ ????????????$info=$flag; ?????????} ????} } echo $info;