check_box

                                <?php while($row = mysqli_fetch_assoc($result)){ ?>
                                    <label class="checkbox-inline">
                                        <?php $study_arr = explode(",", "1,2,4"); ?>
                                        <input type="checkbox" name="study_id[]" value="<?=$row['id'];?>" <?php if(in_array($row['id'], $study_arr)){ echo "checked"; } ?>><?=$row['name'];?>
                                    </label>
                                <?php } ?>

            // checking whether a file is directory or not
            if (is_dir($myfile))
            echo ("$myfile is a directory");
            else
            echo ("$myfile is not a directory");