如何在提交表单后保留以前上传的图像，而不选择要在codeigniter中上传的新图像

I have a simple form that displays an image gallery along with title, image and date. My problem is with the image input.

Selecting a new one and submitting everything works fine but when I'm not selecting any image it saves blank data in the image field.

Is there a way to save the form with the image change being optional?

Controller Code

public function submitwedding()
{
    if(isset($_POST['edit']) && $_POST['edit']=='EDIT')
    {

        move_uploaded_file($_FILES['avatar']['tmp_name'],'uploadimg/'.$_FILES['avatar']['name']);

        $data = array('title'=>$_POST['edit1'],'avatar'=>$_FILES['avatar']['name'],'date'=>$_POST['date']);

        $this->Dbfunction->updatedata('wedding',$data,$_POST['id']);

        redirect(base_url().'index.php/admin/wedding');
    }
}

Front End Coding

<tr>
    <td width="25%" >Title</td>
    <td></td>
    <td width="70%"><input type="text" name="edit1" id="title" style="width:250px"class="form-control" value="<?php echo $row->title ?>"></td>
</tr>
<tr height="10px"></tr>
<tr>
    <td width="25%" >image</td>
    <td></td>
    <td width="70%">
      <input type="file" name="avatar" value="<?php echo $row->avatar;?> "  id="avatar" size="20" /><img src="<?php echo base_url(); ?>uploadimg/<?php echo $row->avatar; ?>"/>
     </td>
</tr>
<tr>
    <td width="25%" >Date</td>
    <td></td>
    <td width="70%"><input type="text" name="date" id="date" style="width:250px"class="form-control" value="<?php echo $row->date ?>"></td>
</tr>

Dbfunction Coding

function selectdatabyid($table , $id)
{
    $query = $this->db->query('select * from '.$table.' where id='.$id);
    return $query->row();
}
function updatedata($table , $data , $id)
{
    $this->db->where('id', $id);
    $this->db->update($table, $data);
}
function deletedata($table, $id)
{
    $this->db->where('id', $id);
    $this->db->delete($table);
}

Why don't you leave the value="" attribute for the image-form-tag empty? When the user submits without selecting a new picture to upload, don't update the field in the database.

Just add an if into your php code:

if(!empty($_POST['avatar'])) {
    // update avatar because input is not empty
}