将PNG上传到网站服务器

Question

我已经看到了很多其他主题，我已经尝试过了。有人可以帮助解释为什么这个脚本不会上传PNG文件？正在显示空白PNG图像。

$image = $_FILES['file']['tmp_name'];
$image_name = $_FILES['file']['name'];
$ext = pathinfo($image_name, PATHINFO_EXTENSION);

$location = "Profiles/{$user}/Picture/{$image_name}";

$new_image = imagecreatetruecolor(100, 100);

$source_image = imagecreatefrompng($image);

imagealphablending($source_image, false);
imagesavealpha($source_image, true);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

imagecopyresampled($new_image, $image, 0, 0, 0, 0, 100, 100, $image_width, $image_height);

imagepng($new_image, '../' . $location, 9);

Answer 1

您未声明$image_width或$image-height，而您在$image中引用$source_image而不是imagecopyresampled()。

我也得到一张纯白色的图像，但在此之后我得到了预期的结果：

$image = $_FILES['file']['tmp_name'];
$image_name = $_FILES['file']['name'];
$ext = pathinfo($image_name, PATHINFO_EXTENSION);

$location = "Profiles/{$user}/Picture/{$image_name}";

$new_image = imagecreatetruecolor(100, 100);

$source_image = imagecreatefrompng($image);

// Get the width & height of the uploaded image.
$image_width = imagesx($source_image);
$image_height = imagesy($source_image);

imagealphablending($source_image, false);
imagesavealpha($source_image, true);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

imagecopyresampled($new_image, $source_image, 0, 0, 0, 0, 100, 100, $image_width, $image_height);

imagepng($new_image, '../' . $location, 9);