ZIP file format is a file format for data compression and document storage. It was originally named Deflate and was invented by Phil Katz in 1989. Information on the format was announced in January.
ZIP usually uses the suffix ".zip", and its MIME format is application/zip. (Recommended Learning: PHPSTORM )
## Current, ZIP format is one of the mainstream compression formats. Its competitors include RAR format and 7Z format of open source code. In terms of performance comparison, RAR and 7z formats have higher compression rates than ZIP formats, and 7-Zip is gradually being used in more fields because it provides free compression tools. Microsoft has built-in support for the zip format starting from the Windows ME operating system. Even if the user does not have decompression software installed on the computer, he can open and create compressed files in the zip format, OS X and popular Linux operating systems. Similar support is provided for the zip format.Therefore, if you spread and distribute files on the Internet, the zip format is often the most commonly used choice.
Because the format is open and free. More and more software have built-in support for opening Zip files. At this time, the Zip file becomes more and more like a compressed transparent folder. Since Windows Me, Windows has built-in support for opening and compressing Zip files with some download software tools, and supports partial downloading of Zip files and then recovery. More and more software have built-in support for opening Zip files. Almost all compression software supports opening and creating Zip files. ZIP is a fairly simple archive format that compresses each file individually. Compressing files separately allows independent files to be retrieved without reading additional data; in theory, this format allows the use of different algorithms for different files. Regardless of the method used, one caveat to this format is that when the archive contains many small files, the archive will be significantly more compressed than compressed into a single file (a classic example in Unix-like systems is A normal tar.gz archive (consisting of a TAR archive compressed using gzip) is larger. The ZIP specification states that files can be stored without compression or using different compression algorithms. However, in practice, ZIP almost always uses Katz's DEFLATE algorithm. ZIP supports a simple password based on a symmetric encryption system, which is now known to have serious flaws, known plaintext attacks, dictionary attacks, and brute force attacks. ZIP also supports volume compression. In recent times, ZIP has added new features including new compression and encryption methods, but these new features are not supported by many tasks and have not been widely used.The above is the detailed content of The compressed file generated by winzip is expanded to. For more information, please follow other related articles on the PHP Chinese website!