519Chapter 28PEAR .Auth User authentication .Benchmark Performance calibration (Apache web server tutorial) .DB Database connectivity
519Chapter 28PEAR .Auth User authentication .Benchmark Performance calibration .DB Database connectivity .Calendar Calendar objects and functions .Archive_Tar Interaction with tar files .Archive_Zip Interaction with Zip files .HTTP Manipulation of the HTTP protocol .Image_Barcode Barcode generation .I18N Internationalization tools .Log Logging .Mail Interaction with POP, IMAP, and SMTP .Oggvorbis Interpretation of the Ogg Vorbis open-source audio file format .Tree Tree structures for organizing objects .SOAP Implementation of the SOAP protocolAside from enabling PHP server administrators to incrementally adjust the capabilities oftheir systems, the PEAR package system is a way of dividing the labor involved in expandingthe capabilities of PHP. Each of the many packages in the system there are more than 250as of this writing has a separate development team behind it, complete with a project leadand several other contributors. Individual packages have version numbers and (usually) theirown supporting documentation. Packages may depend on other packages (meaning that thedepended-upon package must be installed); managing these dependencies is one function ofthe PEAR package-management tool. How the PEAR database worksThe PEAR database serves two purposes: it is by design accessible to human readers as wellas to the PEAR package-management client. You can use an ordinary Web browser to navigatearound the HTML documents at the PEAR site (http://pear.php.net), or you can use thepackage-management client to interface with it via a Web service interface. Either way, the PEAR repository is organized as a tree, with related packages grouped intohierarchies (though hierarchical relationships do not necessarily indicate dependency rela- tionships among packages). The PEAR community manages what goes into the tree, deter- mining when development on a particular package has progressed far enough to warrant anew release into the publicly available repository. The Package ManagerIf, like most people, you re planning to use the PEAR repository as a resource rather than asan entity to which to contribute, your main interaction with it will be through the PEARPackage Manager. The package manager is a command-line program that interacts with theonline repository and allows you to download, install, and uninstall PEAR packages accordingto your requirements. This remainder of this section shows you how to get and use the PEARPackage Manager.
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