How can PHP developers analyze and manipulate headers from external web servers for file downloads?

To analyze and manipulate headers from external web servers for file downloads, PHP developers can use the `get_headers()` function to retrieve the headers of a remote file. They can then parse the headers to extract relevant information such as file size, content type, and download filename. Finally, developers can use the `header()` function to set appropriate headers for the file download, including specifying the file name and content type. 

$url = 'http://example.com/file.zip';
$headers = get_headers($url, 1);

$fileSize = $headers['Content-Length'];
$fileName = basename($url);
$contentType = $headers['Content-Type'];

header('Content-Type: ' . $contentType);
header('Content-Disposition: attachment; filename="' . $fileName . '"');
header('Content-Length: ' . $fileSize);

readfile($url);

Keywords

PHP HTTP headers file downloads cURL response headers

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