<form action="" method="post" enctype="multipart/form-data">

 <div class="form-group">
 <label for="title">Post Title</label>
 <input value="<?php echo $post_title; ?>" type="text" class="form-control" name="post_title">
 </div>
 <div class="form-group">
 <select name="post_category" id="">

 <?php

 $query = "SELECT * FROM categories";
 $select_categories = mysqli_query($connection,$query);

 confirmQuery($select_categories);
 while($row = mysqli_fetch_assoc($select_categories)) {
 $cat_id = $row['cat_id'];
 $cat_title = $row['cat_title'];

 echo "<option value='$cat_id'>{$cat_title}</option>";

 }

 ?>

 </select>
 </div>
 <div class="form-group">
 <label for="title">Post Author</label>
 <input value="<?php echo $post_author; ?>" type="text" class="form-control" name="post_author">
 </div>
 <div class="form-group">
 <label for="post_status">Post Status</label>
 <input value="<?php echo $post_status; ?>" type="text" class="form-control" name="post_status">
 </div>
 <div class="form-group">
 <label for="post_status">Post Image</label>
 <img width="100" src="../images/<?php echo $post_image; ?>" alt="">
 <input type="file" name="image">
 </div>
 <div class="form-group">
 <label for="post_tags">Post Tags</label>
 <input value="<?php echo $post_tags; ?>" type="text" class="form-control" name="post_tags">
 </div>
 <div class="form-group">
 <label for="post_content">Post content</label>
 <textarea class="form-control" name="post_content" id="" cols="30" rows="10"><?php echo $post_content; ?>
 </textarea>
 </div>
 <div class="form-group">
 <input class="btn btn-primary" type="submit" name="update_post" value="Update Post">
 </div>