更新表单详细信息后获取空白图像

问题描述：

In this code when I navigate to the update form I get all the details as per database but when I update the form without selecting the image file it shows blank in the table.

if (isset($_POST['update_sub_categories']))
    {
    $file = $_FILES['Subcategory_image']['tmp_name'];

    this are the conditions for update images
    if (file_exists($file))
        {
        $errors = array();
        $maxsize = 2097152;
        $acceptable = array(
            'image/jpeg',
            'image/jpg',
            'image/gif',
            'image/png'
        );
        if (($_FILES['Subcategory_image']['size'] >= $maxsize) || ($_FILES["Subcategory_image"]["size"] == 0))
            {
            $errors[] = 'File too large. File must be less than 2 megabytes.';

            // code...

            }

        if (!in_array($_FILES['Subcategory_image']['type'], $acceptable) && (!empty($_FILES["Subcategory_image"]["type"])))
            {
            $errors[] = 'Invalid files type. Only JPG, GIF and PNG types are accepted';
            }
        }

Conditions end at this point if no errors are found, the file will be uploaded

    if (count($errors) === 0)
        {
        move_uploaded_file($_FILES['Subcategory_image']['tmp_name'], 'images/categories/' . $_FILES['Subcategory_image']['name']);
        $Subcategory_image = $_FILES['Subcategory_image']['name'];

        // code...

        $m->set_data('Category_id', $Category_id);
        $m->set_data('Subcategory_description', $Subcategory_description);
        $m->set_data('Subcategory_name', $Subcategory_name);
        $m->set_data('Subcategory_image', $Subcategory_image);
        $a = array(
            'Category_id' => $m->get_data('Category_id') ,
            'Subcategory_description' => $m->get_data('Subcategory_description') ,
            'Subcategory_name' => $m->get_data('Subcategory_name') ,
            'Subcategory_image' => $m->get_data('Subcategory_image') ,
        );
        $q = $d->update("sub_categories", $a, "Subcategory_id='$Subcategory_id'");
        if ($q > 0)
            {
            header("location:Manage_subcategories.php");
            }
          else
            {
            echo "Error";
            }
        }
      else
        {
        header("location:Manage_subcategories.php?msg=invalidfile");
        }
    }

So how can i solve this? When i click on the submit button without selecting any image files it shows blank at the table and it does not show the image that is already available

答

You have to put this condition

    $Subcategory_image ="";
        if($Subcategory_id){
           $sql = $d->select("sub_categories", "Subcategory_id="$Subcategory_id);
if($sql->num_rows>0){
        $data=mysqli_fetch_array($sql); 
        $Subcategory_image = $data["Subcategory_image"];
}
        }
            $check = getimagesize($_FILES["Subcategory_image"]["tmp_name"]);
            if($check!=false){
             move_uploaded_file($_FILES['Subcategory_image']['tmp_name'], 'images/categories/' . $_FILES['Subcategory_image']['name']);
             $Subcategory_image = $_FILES['Subcategory_image']['name'];
             $m->set_data('Subcategory_image', $Subcategory_image);
            }
             $m->set_data('Category_id', $Category_id);
             $m->set_data('Subcategory_description', $Subcategory_description);
             $m->set_data('Subcategory_name', $Subcategory_name);

also assign existing image to $Subcategory_image before this condition so that if file control is empty it get old image else of making old image field empty in db table

答

Yeah this is because the image input is taking as null as uploading it to database .. add a additional condition as when there is no image input assign the previous image input to the variable

更新表单详细信息后获取空白图像

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