ayush sharma (づ｡◕‿‿◕｡)づ - Compressing output using GZIP with PHP 5.3

It's pretty hard to compress output with GZIP in PHP 5.3, but in case you ever need to, here's how.

It’s pretty hard to compress output with GZIP in PHP 5.3, but in case you ever need to, here’s how. To test this out, just dump the output to a file using file_put_contents(), and use the command-line gunzip utility to decompress your output. Or you can just vim the compressed file and see your data.

<?php
$string = 'Ayush Sharma';

# Disable ZLIB output compression first
ini_set('zlib.output_compression','Off');

# Compress data
$gzip_output  = "\x1f\x8b\x08\x00\x00\x00\x00\x00";
$size         = strlen($string);
$crc          = crc32($string);
$compressed   = gzcompress($string, 6);
$compressed   = substr($compressed, 0, strlen($compressed) - 4);
$gzip_output .= $compressed . pack('V', $crc) . pack('V', $size);

# You now have compressed output in $gzip_output. The following headers are needed to send over HTTP.
header('Content-Encoding: gzip');
header('Content-Type: application/x-download');
header('Content-Encoding: gzip');
header('Content-Length: ' . strlen($gzip_output));
header('Content-Disposition: attachment; filename="gzipped.response"');
header('Cache-Control: no-cache, no-store, max-age=0, must-revalidate');
header('Pragma: no-cache');

echo $gzip_output;