裁剪图像，保存它

    $filename = '/home/hey/Desktop/images/oldImage.jpg';
    $percent = 0.5;
    // Get new dimensions
    list($width, $height) = getimagesize($filename);
    $new_width = $width * $percent;
    $new_height = $height * $percent;
    // Resample
    $image_p = imagecreatetruecolor($new_width, $new_height);
    $image = imagecreatefromjpeg($filename);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
    file_put_contents("/home/hey/Desktop/images/oldImage.jpg", imagejpeg($image_p));

我只想稍微裁剪一下旧图像并再次保存。怎么了？谢谢。

编辑：图像只是未创建。它创建空图像。