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A step-by-step guide to publishing your own PEAR channels

Build a private channel to distribute PHP packages

Nathan A. Good, Author and Software Engineer, Freelance Developer
Nathan A. Good lives in the Twin Cities area in Minnesota. Professionally, he does software development, software architecture, and systems administration. When he's not writing software, he enjoys building PCs and servers, reading about and working with new technologies, and trying to get his friends to make the move to open source software. He's written and co-written many books and articles, including Professional Red Hat Enterprise Linux 3, Regular Expression Recipes: A Problem-Solution Approach, Regular Expression Recipes for Windows Developers: A Problem-Solution Approach, PHP 5 Recipes: A Problem-Solution Approach, and his latest: Foundations of PEAR: Rapid PHP Development.

Summary:  The PHP Extension and Application Repository (PEAR) is a collection of PHP packages built to ease the development required to build an application. V1.4 of the PEAR package manager introduced the concept of channels, which are a way to organize and deliver packages that can be installed with the package manager. This tutorial discusses channels, introduces and explains the channel.xml file, and demonstrates how to build a channel for distributing packages. Channels are ordinarily used to expose PEAR packages through the Internet, but enterprises can uses channels to make distribution of enterprise-specific PHP code easy.

Date:  30 Jan 2007
Level:  Intermediate

Activity:  3824 views
Comments:  

Troubleshooting

I ran into a few problems when I was working on the start of an implementation for a channel server.

The first issue is that I built the package.xml file by hand. That isn't an issue in itself, but when the pear package command is used to build the package, the package file is reformatted. My implementation of the getDownloadURL function pulled the contents from the old file and returned it as a result of the XML RPC call. This caused an error because the package.xml downloaded didn't match that returned by the xml-rpc call. I suggest using the PEAR_PackageFile class to build your package file so you don't have issues. If you'd rather build the file by hand, make sure the file is the same (including indenting) as the version put into the .tgz file created by the pear package command. I found it useful more than once to pull the generated package.xml file out of the .tgz file and inspect it.

If you get unexpected results from the XML-RPC commands after putting new versions of the xmlrpc.php file in place, make sure your Web server isn't caching anything. Caching can cause unexpected results because you make changes but don't see them reflected.

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