(PHP 5 >= 5.4.0, PHP 7)
zlib_decode — Uncompress any raw/gzip/zlib encoded data
$data
   [, string $max_decoded_len
  ] ) : stringUncompress any raw/gzip/zlib encoded data.
This function is currently not documented; only its argument list is available.
data
max_decoded_len
   Returns the uncompressed data,  or FALSE on failure.