根据您的图片：-

备注：-

首先在assets/uploads/about目录中创建一个名为about的文件夹，并在该文件夹中存储3个不同的图像，然后在about_us数据库表中插入扩展名为的文本和图像路径。

控制器代码：- About_us

<?php 

class About_us extends CI_Controller
{

    function __construct(){
        parent::__construct();
        
    
    }

    public function index()
    {
        echo "This is About us Controllers";
    
    }

    public function edit_about_us()
        {
        $data['about_us'] = $this->db->get('about_us')->result_array();
        $this->load->view('edit_about_us',$data);
        }

        public function updateAbout($aid)
    {       
         if($_FILES['vision_image']['name']!=""){

             $config['upload_path'] = "./assets/uploads/about/";
            $config['allowed_types'] = 'gif|jpeg|png|jpg';
            $this->load->library('upload',$config);
            $this->path = './assets/uploads/about/';

           $this->upload->initialize($config);

            if (!$this->upload->do_upload('vision_image'))
            {
              $error = array('error'=>$this->upload->display_errors());
           }else{
           $imageUpload = $this->upload->data();
           $vision_image_name=$imageUpload['file_name'];
            }
        }
         else{
                $vision_image_name=$this->input->post('vision_image_oldimage');
             
            }
    

      if($_FILES['mission_image']['name']!=""){

             $config['upload_path'] = "./assets/uploads/about/";
            $config['allowed_types'] = 'gif|jpeg|png|jpg';
            $this->load->library('upload',$config);
            $this->path = './assets/uploads/about/';

           $this->upload->initialize($config);

            if (!$this->upload->do_upload('mission_image'))
            {
              $error = array('error'=>$this->upload->display_errors());
           }else{
           $imageUpload = $this->upload->data();
           $mission_image_name=$imageUpload['file_name'];
            }
        }
         else{
                $mission_image_name=$this->input->post('mission_image_oldimage');
             
            }
    


     if($_FILES['whyus_image']['name']!=""){

             $config['upload_path'] = "./assets/uploads/about/";
            $config['allowed_types'] = 'gif|jpeg|png|jpg';
            $this->load->library('upload',$config);
            $this->path = './assets/uploads/about/';

           $this->upload->initialize($config);

            if (!$this->upload->do_upload('whyus_image'))
            {
              $error = array('error'=>$this->upload->display_errors());
           }else{
           $imageUpload = $this->upload->data();
           $whyus_image_name=$imageUpload['file_name'];
            }
        }
         else{
                $whyus_image_name=$this->input->post('image_image_oldimage');
             
            }
    

    $aboutdata = array(
              'vision'=>$this->input->post('our_vision'),
        'vision_image'=>$vision_image_name,
             'mission'=>$this->input->post('our_mission'),
       'mission_image'=>$mission_image_name,
        'why_traavnow'=>$this->input->post('why_traavnow'),
               'image'=>$whyus_image_name);
    

     if($_FILES['vision_image']['name']!=""){
             $getData = $this->db->get_where('about_us', array('id' => $aid))->row_array();
             $getData['vision_image'];
             unlink('assets/uploads/about/'.$getData['vision_image']);
    }
    
    
     if($_FILES['mission_image']['name']!=""){
             $getData = $this->db->get_where('about_us', array('id' => $aid))->row_array();
             $getData['mission_image'];
             unlink('assets/uploads/about/'.$getData['mission_image']);
    }
  

     if($_FILES['whyus_image']['name']!=""){
             $getData = $this->db->get_where('about_us', array('id' => $aid))->row_array();
             $getData['image'];
             unlink('assets/uploads/about/'.$getData['image']);
    }
  
   $updatedata = $this->db->where('id',$aid)->update('about_us',$aboutdata);
    
    if($updatedata)
        {
        redirect(base_url().'index.php/admin/edit_about_us');
        }
        else
        {
            redirect(base_url().'index.php/admin/edit_about_us'); 
        }
    }

    public function view_about_us()
        {
            $this->load->view('view_about_us');
        }

}
?>

查看部分：- edit_about_us.php

<?php
  $this->load->view('includes/dashboard_head.php');
  $this->load->view('includes/dashboard_navbar.php');
  $this->load->view('includes/dashboard_sidebar.php');
?>

<!-- Section for adding/editing banner -->
<div class="content-wrapper" >
    <!-- Content Header (Page header) -->
    <section class="content-header">
      <div class="container-fluid">
        <div class="row mb-2">
          <div class="col-sm-6">
            <h1>Edit About Us</h1>
          </div>
          <div class="col-sm-6">
            <ol class="breadcrumb float-sm-right">
              <li class="breadcrumb-item"><a href="<?php echo base_url() ?>index.php/Dashboard_View">Home</a></li>
              <li class="breadcrumb-item active">About Us Management</li>
            </ol>
          </div>
        </div>
      </div><!-- /.container-fluid -->
    </section>

   <!-- Section for displaying textbox to edit and add aboutUsDetails starts here -->
   <div class="container">

      <div class="container card-header bg-info table-bordered">
         <i class="fas fa-info-circle"></i> <label style="font-weight: bold;">About Us </label>

          <div class="row" style="float: right;">
            <button type="button" class="btn btn-light btn-sm" id="addBTN" onclick="startAdding()" style="margin-right: 6px;" >Add Details</button>
            <button type="button" class="btn btn-light btn-sm" id="editBTN" >Edit Details</button>
          </div>
      </div> 

      <div class="container" style="margin-top: 24px;" >
             <?php
            foreach($about_us as $about){
                 $id = $about['id'];
             $vision = $about['vision'];
       $vision_image = $about['vision_image'];
            $mission = $about['mission'];
      $mission_image = $about['mission_image'];
       $why_traavnow = $about['why_traavnow'];
              $image = $about['image'];

            }


             ?>
            <form method="POST" action="<?php echo base_url().'index.php/About_us/updateAbout/'.$id;?>" enctype="multipart/form-data">  
                            <!-- ============================================================= -->
            <!-- Section for traavnow vision starts here -->

              <!-- Section for our vision text data starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-2 col-form-label">Our Vision:</label>
                <div class="col-sm-10">
                <textarea class="form-control" id="vision" name="our_vision" rows="3"><?php echo $vision;?></textarea>
                </div>
              </div>
              <!-- Section for our vision text data ends here -->

              <!-- Section for Uploading Image File to Our Vision Section Starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-4 col-form-label" >Upload Image:</label>
                
                <div class="col-sm-4">
                 <input type="hidden" name="vision_image_oldimage"  value="<?php echo $vision_image;?>">
                                        
                  <input type="file" class="form-control-file" id="vision_image" name="vision_image">
                </div>

                <div class="col-sm-4" style="margin-top: 24px;">
                  <img src="<?php echo base_url('/assets/uploads/about/'.$vision_image);?>" class="img-fluid rounded table-bordered" alt="Vision Image" style="height: 110px; width: 110px;">
                </div>

                
                
              </div>             
              <!-- Section for Uploading Image File to Our Vision Section ends here -->
            <!-- Section for traavnow vision ends here -->
            <!-- ============================================================= -->

            <!-- ============================================================= -->
            <!-- Section for traavnow mission starts here -->
              <!-- Section for our mission text data starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-2 col-form-label">Our Mission:</label>
                <div class="col-sm-10">
                   <textarea class="form-control" id="mission" name="our_mission" rows="3"><?php echo $mission;?></textarea>
                </div>
              </div>
              <!-- Section for our mission text data ends here -->

              <!-- Section for Uploading Image File to Our mission Section Starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-4 col-form-label">Upload Image:</label>
                
                <div class="col-sm-4">
                 <input type="hidden" name="mission_image_oldimage"  value="<?php echo $mission_image;?>">
                  <input type="file" class="form-control-file" id="mission_image" name="mission_image">
                </div>

                <div class="col-sm-4" style="margin-top: 24px;">
                  <img src="<?php echo base_url('/assets/uploads/about/'.$mission_image);?>" class="img-fluid rounded table-bordered" alt="Mission Image" style="height: 110px; width: 110px;">
                </div>
                
              </div>             
              <!-- Section for Uploading Image File to Our mission Section ends here -->
            <!-- Section for traavnow mission ends here -->
            <!-- ============================================================= -->

            <!-- ============================================================= -->
            <!-- Section for traavnow why_traavnow starts here -->
              <!-- Section for our why_traavnow text data starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-2 col-form-label">Why Traavnow:</label>
                <div class="col-sm-10">
                   <textarea class="form-control" id="why_traavnow" name="why_traavnow" rows="3"><?php echo $why_traavnow;?></textarea>
                </div>
              </div>
              <!-- Section for our why_traavnow text data ends here -->

              <!-- Section for Uploading Image File to Our why_traavnow Section Starts here -->
              <div class="form-group row">
                <label for="staticEmail" class="col-sm-4 col-form-label">Upload Image:</label>
                
                <div class="col-sm-4">
               <input type="hidden" name="image_image_oldimage"  value="<?php echo $image;?>">

                  <input type="file" class="form-control-file" id="whyus_image" name="whyus_image">
                </div>

                <div class="col-sm-4" style="margin-top: 24px;">
                  <img src="<?php echo base_url('/assets/uploads/about/'.$image);?>" class="img-fluid rounded table-bordered" alt="Why Traavnow" style="height: 110px; width: 110px;">
                </div>
                
              </div>             
              <!-- Section for Uploading Image File to Our why_traavnow Section ends here -->
            <!-- Section for traavnow why_traavnow ends here -->
            <!-- ============================================================= -->

            <!-- ============================================================= -->
            <!-- Button responding to form submission starts here -->
           
             <div class="form-group row">
                <label for="staticEmail" class="col-sm-2 col-form-label"></label>
                <div class="col-sm-10">
                   <button class="btn btn-primary form-control" id="updateBTN" name="update" type="submit">Update Details</button>

                </div>
              </div>
            <!-- Button responding to form submission ends here -->
            <!-- ============================================================= -->

            <div style="height: 120px;"></div>
           
         </form>

      </div>
    
   </div>
   <!-- Section for displaying textbox to edit and add aboutUsDetails ends here -->

   <!-- Function for Disabling button; if no data is inserted in the database, starts here -->
      <script type="text/javascript">
          window.onload = function()
          {
            var txt = document.getElementById('vision');
            var btn = document.getElementById('editBTN');
            var btn1 = document.getElementById('addBTN');

            if(txt.value == '')
            {
              
              btn.disabled=true;
              document.getElementById('updateBTN').innerHTML = "Add About Us";
            }

            else{
              btn.disabled=false;
              btn1.disabled=true;
              document.getElementById('updateBTN').innerHTML = "Update About Us";
            }
          }
          // function for moving cursor to the first box to add new details
          function startAdding(){
            document.getElementById("vision").focus();
          }
      </script>
   <!-- Function for Disabling button if no data is inserted in the database ends here -->


  <!-- Control Sidebar -->
  <aside class="control-sidebar control-sidebar-dark">
    <!-- Control sidebar content goes here -->
  </aside>
  <!-- /.control-sidebar -->
</div>
<!-- ./wrapper -->

<?php
  $this->load->view('includes/dashboard_footer.php');
  $this->load->view('includes/dashboard_jquery.php');
  
?>

注意：-关于生成查询结果：-

https://codeigniter.com/userguide3/database/results.html

关于文件上传：-

https://codeigniter.com/userguide3/libraries/file_uploading.html