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Possible Duplicate:
Which compression method to use in PHP?
It seems that PHP has many functions for making smaller strings out of strings. These functions are called inflate/deflate, encode/decode, and compress/uncompress. Some of them seem compatible with each other, as all are base on the zlib library. What is the differences between them, and when to use each?
As stated in the function documentation linked to from the page in your link:
gzdeflate – use the ‘clean’ DEFLATE algorithm with the deflate data format.
gzcompress – use the ZLIB data format that add extra header and trailer data on the DEFLATE algorithm. As to RFC 1950 it “can be easily extended to use
other compression methods”.
gzencode – use the gzip application data format that includes some more header data over the ZLIB format.