<?php
// gzip.php v1.2 - read http://rm.pp.ru/?1.phpgzip
// released on 2004-05-06, by Roman Mamedov<roman at rm.pp.ru>
// license: do with this code whatever you want.

///// Configuration //////////////////
$PREFER_DEFLATE = false; // prefer deflate over gzip when both are supported
$FORCE_COMPRESSION = false; // force compression even when client does not report support
//////////////////////////////////////

function compress_output_gzip($output) {
	return gzencode($output);
}

function compress_output_deflate($output) {
	return gzdeflate($output, 9);
}

if(isset($_SERVER['HTTP_ACCEPT_ENCODING']))
	$AE = $_SERVER['HTTP_ACCEPT_ENCODING'];
else
	$AE = $_SERVER['HTTP_TE'];

$support_gzip = (strpos($AE, 'gzip') !== FALSE) || $FORCE_COMPRESSION;
$support_deflate = (strpos($AE, 'deflate') !== FALSE) || $FORCE_COMPRESSION;

if($support_gzip && $support_deflate) {
	$support_deflate = $PREFER_DEFLATE;
}

if ($support_deflate) {
	header("Content-Encoding: deflate");
	ob_start("compress_output_deflate");
} else{
	if($support_gzip){
		header("Content-Encoding: gzip");
		ob_start("compress_output_gzip");
	} else {
		ob_start();
	}
}
?>