实验吧——你真的会PHP吗？（intval范围 php中00的利用）

 1 <?php 2 ?3 ?4 $info = ""; ?5 $req = []; 6 $flag="xxxxxxxxxx"; 7 ?8 ini_set("display_error", false); ?9 error_reporting(0); 10 11 12 if(!isset($_POST[‘number‘])){13 ???header("hint:6c525af4059b4fe7d8c33a.txt");14 15 ???die("have a fun!!"); 16 }17 18 foreach([$_POST] as $global_var) { 19 ????foreach($global_var as $key => $value) { 20 ????????$value = trim($value); 21 ????????is_string($value) && $req[$key] = addslashes($value); 22 ????} 23 } 24 25 26 function is_palindrome_number($number) { 27 ????$number = strval($number); 28 ????$i = 0; 29 ????$j = strlen($number) - 1; 30 ????while($i < $j) { 31 ????????if($number[$i] !== $number[$j]) { 32 ????????????return false; 33 ????????} 34 ????????$i++; 35 ????????$j--; 36 ????} 37 ????return true; 38 } 39 40 41 if(is_numeric($_REQUEST[‘number‘])){42 ????43 ???$info="sorry, you cann‘t input a number!";44 45 }elseif($req[‘number‘]!=strval(intval($req[‘number‘]))){46 ??????47 ?????$info = "number must be equal to it‘s integer!! "; ?48 49 }else{50 51 ?????$value1 = intval($req["number"]);52 ?????$value2 = intval(strrev($req["number"])); ?53 54 ?????if($value1!=$value2){55 ??????????$info="no, this is not a palindrome number!";56 ?????}else{57 ??????????58 ??????????if(is_palindrome_number($req["number"])){59 ??????????????$info = "nice! {$value1} is a palindrome number!"; 60 ??????????}else{61 ?????????????$info=$flag;62 ??????????}63 ?????}64 65 }66 67 echo $info;