How to handle the rotation direction of images when saving remote images using PHP?

How to handle the rotation direction of images when saving remote images using PHP?

In our daily development, we often encounter the need to save remote pictures. However, sometimes due to limitations of shooting equipment, remote pictures may contain rotation direction information, which requires us to save the picture. The direction of rotation is processed during the process. This article will introduce how to handle the rotation direction when saving remote images using PHP, and provide code examples.

First, we need to download the image to the local through the URL of the remote image. You can use PHP's file_get_contents() function to achieve this:

$url = '远程图片的URL';
$image = file_get_contents($url);

// 文件名和路径
$filename = '保存的文件名.jpg';
$save_path = '保存的路径';
file_put_contents($save_path . $filename, $image);

Next, we need to get the rotation direction of the remote image. Images in JPEG format usually store rotation direction information in the Exif data of the image file. We can use PHP's Exif extension to obtain this information:

// 通过 Exif 扩展获取旋转方向
$exif = exif_read_data($save_path . $filename);

if (!empty($exif['Orientation'])) {
    // 根据旋转方向进行相应的处理
    switch ($exif['Orientation']) {
        case 3:
            // 旋转180度
            $image = imagerotate($image, 180, 0, 0);
            break;
        case 6:
            // 旋转顺时针90度
            $image = imagerotate($image, -90, 0, 0);
            break;
        case 8:
            // 旋转逆时针90度
            $image = imagerotate($image, 90, 0, 0);
            break;
    }
}

// 保存处理后的图片
file_put_contents($save_path . $filename, $image);

In the above code, we obtain the Exif data of the image through the exif_read_data() function and determine whether the Orientation field exists. If there is rotation direction information, we use the imagerotate() function to rotate the image accordingly. Finally, save the processed image locally.

It should be noted that when using the imagerotate() function to rotate images, you need to install and enable the GD extension.

Through the above code examples, we can easily handle the rotation direction issue when saving remote images using PHP. In this way, whether you are developing a website or a mobile application, you can get pictures in the correct direction.

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