用php写简单的分页器

<?php

                    $zy = 6;

                    $p = isset($_GET['p']) ? $_GET['p'] : 1;

                    $up = $p-1;

                    $down = $p+1;

                    if($up == 0){ 

                        ?>

                        <a href="javascript">上一页</a>

                        <?php

                    }else{

                        ?>

                        <a href="inter1.php?p=<?php echo$up;?>">上一页</a>

                        <?php

                    }

                    ?>

                    <?php

                    for($i = 1;$i<=$zy;$i++){

                        if($p == $i){

                            ?>

                            <a href="inter1.php?p=<?php echo$i;?>" class="acti"><?php echo$i;?></a>

                            <?php

                        }else{

                            ?>

                            <a href="inter1.php?p=<?php echo$i;?>" class=""><?php echo$i;?></a>

                            <?php

                        }

                        

                    }

                    

                    ?>

                    <?php

                    if($down >$zy){

                        ?>

                        <a href="javascript">下一页</a>

                        <?php

                    }else{

                        ?>

                        <a href="inter1.php?p=<?php echo$down;?>">下一页</a>

                        <?php

                    }

                    

                    

                    ?>