如果不更新图像codeigniter Php，则图像列为null

Question

I am trying to update firstname,lastname,image in codeigniter,But whenever i update only first_name and last_name(not image) then image column become null in mysql,Where i am wrong Here is my code

Here is my model

$add_data['first_name'] = ($this->input->post('first_name') && !empty($this->input->post('first_name'))) ? $this->input->post('first_name') : NULL;     
$add_data['last_name'] = ($this->input->post('last_name') && !empty($this->input->post('last_name'))) ? $this->input->post('last_name') : NULL;     

$saveArr = [];
    if(!empty($this->input->post('first_name'))){
       $saveArr['first_name'] = $this->input->post('first_name');
    }
    if(!empty($this->input->post('last_name'))){
       $saveArr['last_name'] = $this->input->post('last_name');
    }   
if(!file_exists($_FILES['image']['tmp_name']) || !is_uploaded_file($_FILES['image']['tmp_name'])) 
    {
        $saveArr['image'] = $_FILES['image'];
    }
    else
    {
        $filename=time().uniqid(rand()).$_FILES['image']['name'];
        move_uploaded_file($_FILES["image"]["tmp_name"], "images/" . $filename);
        $saveArr['image']=$filename;
    }
$this->db->where('id',$add_data['user_id']);
$query=$this->db->update('users',  $saveArr);

Answer 1

In both condition you set $saveArr['image'], you just need to set $saveArr['image'] when upload new image. so just remove line $saveArr['image'] = $_FILES['image'];

Use below updated code.

 $add_data['first_name'] = ($this->input->post('first_name') && !empty($this->input->post('first_name'))) ? $this->input->post('first_name') : NULL;     
    $add_data['last_name'] = ($this->input->post('last_name') && !empty($this->input->post('last_name'))) ? $this->input->post('last_name') : NULL;     

    $saveArr = [];
        if(!empty($this->input->post('first_name'))){
           $saveArr['first_name'] = $this->input->post('first_name');
        }
        if(!empty($this->input->post('last_name'))){
           $saveArr['last_name'] = $this->input->post('last_name');
        }   
    if(!file_exists($_FILES['image']['tmp_name']) || !is_uploaded_file($_FILES['image']['tmp_name'])) 
        {

        }
        else
        {
            $filename=time().uniqid(rand()).$_FILES['image']['name'];
            move_uploaded_file($_FILES["image"]["tmp_name"], "images/" . $filename);
            $saveArr['image']=$filename;
        }
    $this->db->where('id',$add_data['user_id']);
    $query=$this->db->update('users',  $saveArr);