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$contents=file_get_contents("http://www.govtrack.us/data/us/gis/zip4dist-prefix.txt.gz");
$file = fopen($file_name, "wb");
fwrite($file, $contents);
fclose($file);
$handle = fopen("http://www.govtrack.us/data/us/gis/zip4dist-prefix.txt.gz", "rb");
$file = fopen($file_name, "wb");
$contents = '';
while (!feof($handle)) {
$contents = fread($handle, 8192);
fwrite($file, $contents);
}
fclose($file);
fclose($handle);