How to delete the original link after saving the remote image to the server in PHP?

How to delete the original link after PHP saves the remote image to the server?

When developing web applications, we often need to save images from remote servers to the local server. Saving images can help us increase access speed and reduce dependence on remote servers. However, after saving the image, we also need to remove the original link to avoid leaking the image and wasting space. In this article, I will show you how to delete the original link after saving a remote image to the server using PHP.

Step 1: Check whether the remote link is valid

Before saving the remote picture, we first need to check whether the remote link is valid. You can use the get_headers() function to obtain the header information of the link, and check whether the HTTP status code is 200, indicating that the link is valid. The following is a sample code:

$url = "http://example.com/image.jpg";
$headers = get_headers($url);

if ($headers[0] == 'HTTP/1.1 200 OK') {
    // 链接有效，可以进行保存操作
} else {
    // 链接无效，不进行保存操作
}

Step 2: Save the remote image to the server

Once the link is confirmed to be valid, we can use the file_put_contents() function to save the remote image to the server. The following is a sample code:

$url = "http://example.com/image.jpg";
$filename = "saved_image.jpg";

if ($headers[0] == 'HTTP/1.1 200 OK') {
    $image = file_get_contents($url);
    file_put_contents($filename, $image);
}

In the above example, we used the file_get_contents() function to get the contents of the remote image and file_put_contents() Function saves the contents to a local file.

Step 3: Delete the original link

After saving the remote image to the server, we also need to delete the original link to ensure that the image is no longer directly accessible. Files can be deleted using the unlink() function. Here is a sample code:

if ($headers[0] == 'HTTP/1.1 200 OK') {
    $image = file_get_contents($url);
    file_put_contents($filename, $image);

    // 删除原始链接
    unlink($url);
}

In the above example, we used the unlink() function to remove the original link.

Summary

In this article, we learned how to use PHP to save remote images to the server and then delete the original link. First, we use the get_headers() function to check whether the remote link is valid. Then, use the file_get_contents() function to get the contents of the remote image, and use the file_put_contents() function to save it to the local server. Finally, use the unlink() function to remove the original link. In this way, we can protect the security of the image and reduce the waste of server space while saving the image. Hope this article helps you!

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