PHP Manual . ... PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) gzopen -- Open gz-file . int gzopen ( string filename, string mode [, int use_include_path]) . Opens a gzip (.gz) file for reading or writing. The mode parameter is as in fopen() ("rb" or "wb") but can also include a compression level ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for Huffman only compression as in "wb1h". ... Example 1. gzopen() Example . fp = gzopen ("/tmp/file.gz", "r"); . ...