Get Size of Download using HTTP HEAD

Get the size of a download using an HTTP HEAD request.

Download Chilkat HTTP ActiveX

<?php

$http = new COM("Chilkat.Http");

//  Any string unlocks the component for the 1st 30-days.
$success = $http->UnlockComponent('Anything for 30-day trial.');
if ($success != true) {
    print $http->lastErrorText() . "\n";
    exit;
}

$resp = $http->GetHead('http://www.chilkatsoft.com/download/ChilkatDotNet2.msi');
if (is_null($resp)) {
    print $http->lastErrorText() . "\n";
}
else {

    $sizeStr = $resp->getHeaderField('Content-Length');
    if (is_null($sizeStr)) {
        print 'No content-length header field' . "\n";
    }
    else {
        //  Show the size of the file.
        //  You may convert the size string to an integer...
        print $sizeStr . "\n";
    }

}

?>