What Is PEAR?
At its core, PEAR is a collection of useful, quality-controlled, open source packages that you can include in your projects. The aim of the quality control is not only to ensure that you can rely on the code, but also that packages are interoperable—that is, that they work well with one another. So, when you download one package to help with a project, it might work with any number of other PEAR packages. In the best traditions of object-oriented design, all PEAR packages are designed to be as flexible and extensible as possible.
 | PEAR is also home for C extensions to PHP. This aspect of the PEAR project is called the PHP Extension ... |
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