Had some trouble finding the correct way to send a Content-Length header with HTTP compression.
The pitch is to use gzencode (not gzdeflaten not gzcompress).
// disable ZLIB ouput compression
ini_set('zlib.output_compression','Off');
// compress data
$gzipoutput = gzencode($output,6);
// various headers, those with # are mandatory
header('Content-Type: application/x-download');
header('Content-Encoding: gzip'); #
header('Content-Length: '.strlen($gzipoutput)); #
header('Content-Disposition: attachment; filename="myfile.name"');
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Pragma: no-cache');
// output data
echo $gzipoutput;
function _compress( $data ) {
$supportsGzip = strpos( $_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip' ) !== false;
if ( $supportsGzip ) {
$content = gzencode( trim( preg_replace( '/\s+/', ' ', $data ) ), 9);
} else {
$content = $data;
}
$offset = 60 * 60;
$expire = "expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";
header('Content-Encoding: gzip');
header("content-type: text/html; charset: UTF-8");
header("cache-control: must-revalidate");
header( $expire );
header( 'Content-Length: ' . strlen( $content ) );
header('Vary: Accept-Encoding');
echo $content;
}
_compress( "Some test data" );
if (isset($headers['Content-Encoding']) && ($headers['Content-Encoding'] === 'gzip' || $headers['Content-Encoding'] === 'deflate'))
{
if ($headers['Content-Encoding'] === 'gzip')
{
$buffer = substr($buffer, 10);
}
$contents = @gzinflate($buffer);
if ($contents === false)
{
return false;
}
}
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