PEAR Manual
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# Why does the directory structure of pear/ and pear-core/ differ?

The directory structure of `pear-core/` matches that of the install tree (by default `/usr/local/lib/php`), and are organized as a simple hierarchy. However, the directory structure of `pear/` is based on what package the files belong to. Where files are located in each package directory is completely independent from where they end up being installed, this is all determined by the package description file.

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Why is PEAR separated into pear/ and pear-core/? | Up | Why a flat directory structure instead of a deep?