babyphp.php

 <?php

 require_once('flag.php');
 error_reporting(0);

 if(!isset($_GET['msg'])){
	     highlight_file(__FILE__);
	         die();
 }

 @$msg = $_GET['msg'];
 if(@file_get_contents($msg)!=="Hello Challenge!"){
	     die('Wow so rude!!!!1');
 }

 echo "Hello Hacker! Have a look around.\n";

 @$k1=$_GET['key1'];
 @$k2=$_GET['key2'];

 $cc = 1337;$bb = 42;

 if(intval($k1) !== $cc || $k1 === $cc){
	     die("lol no\n");
 }

 if(strlen($k2) == $bb){
	     if(preg_match('/^\d+＄/', $k2) && !is_numeric($k2)){
		             if($k2 == $cc){
				                 @$cc = $_GET['cc'];
						         }
			         }
 }

 list($k1,$k2) = [$k2, $k1];

 if(substr($cc, $bb) === sha1($cc)){
	     foreach ($_GET as $lel => $hack){
		             $$lel = $hack;
			         }
 }

 $‮b = "2";$a="‮b";//;1=b

 if($$a !== $k1){
	     die("lel no\n");
 }

 // plz die now
 // assert_options(ASSERT_BAIL, 1);
 // assert("$bb == $cc");
 //
 // echo "Good Job ;)";
 // // TODO
 // // echo $flag;