#!/usr/bin/php
<?php
    $input_stream = fopen("test.txt.gz", "rb");

    stream_filter_append(
      $input_stream,
      'zlib.inflate',
      STREAM_FILTER_READ,
      array(
        'window' => $argv[1],
      ));

    $input_data = '';
    while (!feof($input_stream)) {
      $read_bytes = fread($input_stream, 64 * 1024);
      $input_data .= $read_bytes;
    }
    fclose($input_stream);

    $myfile = fopen("test.txt", "w");
    fwrite($myfile, $input_data);
    fclose($myfile);