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형식@ title collumn attachment compression checkbox.
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note that zziplib only provides a subset of functions provided in a full implementation of the zip compression algorithm and can only read zip file archives. a normal zip utility is needed to create the zip file archives read by this library.
a normal zip utility is needed to create the zip file archives read by this library.

this function returns a compressed version of the input data using the deflate data format, or false if an error is encountered. the optional parameter level can be given as 0 for no compression up to 9 for maximum compression.
the optional parameter level can be given as 0 for no compression up to 9 for maximum compression.

for details on the deflate compression algorithm see the document "deflate compressed data format specification version 1.3" (rfc 1951).
see also gzinflate(), gzcompress(), gzuncompress(), gzencode().

this function returns a compressed version of the input data compatible with the output of the gzip program, or false if an error is encountered. the optional parameter level can be given as 0 for no compression up to 9 for maximum compression, if not given the default compression level will be the default compression level of the zlib library.
the optional parameter level can be given as 0 for no compression up to 9 for maximum compression, if not given the default compression level will be the default compression level of the zlib library.

clibpdf lets you create pdf documents with php. it is available at fastio but it isn't free software. you should definitely read the licence before you start playing with clibpdf. if you cannot fullfil the licence agreement consider using pdflib by thomas merz, which is also very powerful. clibpdf functionality and api is similar to thomas merz's pdflib but, according to fastio, clibpdf is faster and creates smaller documents. this may have changed with the new version 2.0 of pdflib. a simple benchmark (the pdfclock.c example from pdflib 2.0 turned into a php script) actually shows no difference in speed at all. the file size is also similar if compression is turned off. so, try them both and see which one does the job for you.
many functions in the native clibpdf and the php module, as well as in pdflib, have the same name.