CTF中php語言之is_numeric()和sleep()函數的繞過

` <?php include 'flag.php'; isset($_GET['time'])?$time = $_GET['time']:$time = 0; isset($_GET['num'])?$num = $_GET['num']:$num = 0; $c=is_numeric($time) and is_numeric($num); if ($num == 0) { if($
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