PCLZIP_OPT_EXTRACT_IN_OUTPUT

This argument gives you the ability to extract the content of a file directly in the standard output (like the echo command).

    $archive = new PclZip('test.zip');
    $list = $archive->extract(PCLZIP_OPT_BY_NAME, "data/readme.txt",
                              PCLZIP_OPT_EXTRACT_IN_OUTPUT);
    if ($list == 0) {
      echo "ERROR : ".$archive->errorInfo(true);
    } 

see also PCLZIP_OPT_EXTRACT_AS_STRING