gzip_compression.php

全新且完善的强大网上商店系统

<?php



function tep_check_gzip() {
    global $HTTP_ACCEPT_ENCODING;
    if (headers_sent() || connection_aborted()) {
      return false;
    }
    if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return 'x-gzip';
    if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return 'gzip';
    return false;
}

function tep_gzip_output($level = 5) {
   if ($encoding = tep_check_gzip()) {
      $contents = ob_get_contents();
      ob_end_clean();
      header('Content-Encoding: ' . $encoding);
      $size = strlen($contents);
      $crc = crc32($contents);
      $contents = gzcompress($contents, $level);
      $contents = substr($contents, 0, strlen($contents) - 4);
      echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
      echo $contents;
      echo pack('V', $crc);
      echo pack('V', $size);
   } else {
      ob_end_flush();
   }
}
?>