How to save image from URL in server folder using php or javascript?

You can use file_get_contents($url) in order to retrieve the contents of any remote file if you have allow_url_fopen enabled in your PHP configuration.

Once you download the image into memory, then you can save it with

file_put_contents($img, $imgcontent)

Example might look like this:

$url = 'https://www.google.com/abc/files/AwAh20isBECxwscp4JiT';
$img = '/my/folder/flower.gif';
file_put_contents($img, file_get_contents($url));

If you don't allow remote URLs to be opened by fopen(), then you have the option of using the cURL functionality to grab files remotely.

$ch = curl_init('http://example.com/image.php');
$fp = fopen('/my/folder/flower.gif', 'wb');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
fclose($fp);

Duplicate of: Saving image from PHP URL