array loop never stop

                           <?php
                                $ulang = true;
                                for ($i=1; $i <=3 ; $i++) { 
                                    for ($j=1; $j <= 7 ; $j++) { 
                                        if ($c[$i][$j] == $cS[$i][$j]) {

                                        }else{
                                            $ulang = false;
                                        }
                                    }
                                }
                            ?>

                            <?php 
                                if ($ulang == false) {
                                    // echo $stop;
                            ?>
                                    <form action="kms.php" method="POST">

                            <?php 
                                }else{
                                    // echo $stop;
                            ?>

i have a problem with my project, loop never stop. whats is wrong with my syntax? please help me!