Here's the best way (that I've found) to get the size of a remote file. Note that HEAD requests don't get the actual body of the request, they just retrieve the headers. So making a HEAD request to a resource that is 100MB will take the same amount of time as a HEAD request to a resource that is 1KB.
Note: This will only work if the remote host is supplying valid content header, namely Content-Length. You cannot otherwise get file size without actually downloading it first.
Note: This will only work if the remote host is supplying valid content header, namely Content-Length. You cannot otherwise get file size without actually downloading it first.
<?php
/*
Online PHP Examples with Source Code
website: http://4evertutorials.blogspot.in/
*/
$remoteFileURL = 'http://us.php.net/get/php-5.2.10.tar.bz2/from/this/mirror';
$ch = curl_init($remoteFileURL);
curl_setopt($ch, CURLOPT_NOBODY, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); //not necessary unless the file redirects (like the PHP example we're using here)
$data = curl_exec($ch);
curl_close($ch);
if ($data === false) {
echo 'cURL failed';
exit;
}
$contentLength = 'unknown';
$status = 'unknown';
if (preg_match('/^HTTP\/1\.[01] (\d\d\d)/', $data, $matches)) {
$status = (int)$matches[1];
}
if (preg_match('/Content-Length: (\d+)/', $data, $matches)) {
$contentLength = (int)$matches[1];
}
echo 'HTTP Status: ' . $status . "\n";
echo 'Content-Length: ' . $contentLength;
?>
Result:
HTTP Status: 302 Content-Length: 8808759
