<?php
/* gzip.php by detour@metalshell.com
 *
 * Use the zlib functions in php to compress a file.
 *
 * http://www.metalshell.com/
 *
 */

/* Clearly this string isn't worth compressing as it will get
   bigger with the headers, but you get the idea. */
$str = "Compressed string";
$gzfile = "/tmp/file.gz";

// Compress our string.

write_gzip_file($str, $gzfile);

// Read the compressed file and display it.

print read_gzip_file($gzfile);


function read_gzip_file($file) {
  // Open gzip for reading.

  $fpgz = gzopen($file, "r");

  // Read the data.

  $retval = gzread($fpgz, filesize($file));

  // Close the file.

  gzclose($fpgz);

  return $retval;
}

function write_gzip_file($data, $file) {
  // Open the gzip file stream. The 9 is the compression level.

  $fpgz = gzopen($file, "w9");

  // Compress as the string is written.

  gzwrite($fpgz, $data);

  // Close the stream.

  gzclose($fpgz);
}

?>