收集一些

<?php
include("flag.php");
highlight_file(__FILE__);
if(isset($_GET['num'])){
$num = $_GET['num'];
if($num==4476){
die("no no no!");
}
if(preg_match("/[a-z]/i", $num)){
die("no no no!");
}
if(intval($num,0)==4476){
echo $flag;
}else{
echo intval($num,0);
}
}

<?include("flag.php");
$_GET?$_GET=&$_POST:'flag';
$_GET['flag']=='flag'?$_GET=&$_COOKIE:'flag';
$_GET['flag']=='flag'$_GET=&$_SERVER:'flag';
highlight_file($_GET['HTTP_FLAG']=='flag'?$flag:__FILE__); ?>

<meta charset="utf-8">
<?php
highlight_file(__FILE__);
include('flag.php');
error_reporting(0);
$error='你还想要flag嘛？';
$suces='既然你想要那给你吧！';
foreach($_GET as $key => $value){
if($key==='error'){
die("what are you doing?!");
}
$$key=$$value; #
}foreach($_POST as $key => $value){
if($value==='flag'){
die("what are you doing?!");
}
$$key=$$value;
}
if(!($_POST['flag']==$flag)){
die($error);
}
echo "your are good".$flag."\n"; #
die($suces);