Question

我有一个不需要用于图片上传的字段..问题是，如果用户不添加图片，它仍然会添加重命名的图像，而不会显示。

所以基本上它在数据库中放了一个名字

     if (isset($_POST['submit'])) {

         $Name = $_POST['name'];
         $Description = $_POST['description']; 

         $file = $_FILES['photo']['name'];
         $ext = pathinfo($file, PATHINFO_EXTENSION);
         $rename_image = generate_random(12);
         $file_loc = $_FILES['photo']['tmp_name'];
         $file_type = $_FILES['photo']['type'];
         $file_size = $_FILES['photo']['size'];
         $newFilename = $rename_image . '.' . $ext;
         $folder = "../uploads/"; 

         if (empty($Name)) {
             $errors[] = "Name Required.";
         }

         if (!empty($_FILES['photo']['name'])) { 
         }

         if (($file_size > 2097152)) {

             echo validation_errors("Your avatar exceeds file size");
         } elseif (($file_type != "image/jpeg") && ($file_type != "image/jpg") && ($file_type != "image/gif") && ($file_type != "image/png")) {

             echo validation_errors("Invalid image format.");     


         if (!empty($errors)) {
             echo validation_errors($errors[0]);

         } else {

        move_uploaded_file($file_loc, $folder.$newFilename);

        $db = dbconnect();
        $stmt = $db->prepare("INSERT INTO discussion_categories(Name, Description, Photo) VALUES (?,?,?)");
        $stmt->bind_param('sss', $Name, $Description, $newFilename);
        $stmt->execute();        
        $stmt->close(); 

        header("Location: managecategories.php");

    }
  }
}

Answer 1

在使用之前检查参数变量是否已设置。

if (windowWidth == sec1LogoWidth) {
        $('#sec1-logo img').css({'top': Math.abs(windowHeight - ((sec1LogoHeight*2)+(Math.ceil(sec1LogoHeight/2)))),'left': 0, 'margin-left': 10, 'margin-right': 10 });
    } else {
        $('#sec1-logo img').css({'top': Math.abs(windowHeight - ((sec1LogoHeight*2)+(Math.ceil(sec1LogoHeight/2)))) - 100,'left': Math.abs((windowWidth / 2) - (sec1LogoWidthImg-(Math.ceil(sec1LogoWidthImg/2)))) });
    }

Answer 2

使用file_exists或/和is_uploaded_file函数检查文件是否存在或上传。

if(file_exists($_FILES['photo']['tmp_name']) || is_uploaded_file($_FILES['photo']['tmp_name']) {
    $file = $_FILES['photo']['name'];
    $ext = pathinfo($file, PATHINFO_EXTENSION);
    $rename_image = generate_random(12);
    $file_loc = $_FILES['photo']['tmp_name'];
    $file_type = $_FILES['photo']['type'];
    $file_size = $_FILES['photo']['size'];
    $newFilename = $rename_image.
    '.'.$ext;
    $folder = "../uploads/";

    if (($file_size > 2097152)) {
        echo validation_errors("Your avatar exceeds file size");
    }
    else if(($file_type != "image/jpeg") && ($file_type != "image/jpg") && ($file_type != "image/gif") && ($file_type != "image/png")) {
        echo validation_errors("Invalid image format.");
    }
    else {
        move_uploaded_file($file_loc, $folder.$newFilename);
    }
}

空字段仍然发送信息

2 个答案: