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Package dependencies


  • Depends: Package A depends on package B if B absolutely must be installed in order to use A. In some cases, A depends not only on B, but on a specific version of B. In this case, the version dependency is usually a lower limit, in the sense that A depends on any version of B more recent than some specified version.

  • Recommends: Package A recommends package B if the package maintainer judges that most users would not want A without also having the functionality provided by B.

  • Suggests: Package A Suggests package B if B contains files that are related and enhance the functionality of A. The same relationship is expressed by declaring that package B Enhances package A.

  • Conflicts: Package A Conflicts with package B when A will not operate properly if B is installed on the system. Conflicts status is often combined with Replaces

  • Replaces: Package A Replaces package B when files installed by B are removed of overwritten by files in A.

  • Provides: Package A provides package B when all of the files and functionality of B are incorporated into A.

Debian Package Dependencies

Go PHP5



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PHP developers cannot leverage PHP 5′s full potential without dropping support for PHP 4, but PHP 4 is still installed on a majority of shared web hosts and users would then be forced to switch to a different application. Web hosts cannot upgrade their servers to PHP 5 without making it impossible for their users to run PHP 4-targeted web apps, and have no incentive to go to the effort of testing and deploying PHP 5 while most web apps are still compatible with PHP 4 and the PHP development team still provides maintenance support for PHP 4. The PHP development team, of course, can’t drop maintenance support for PHP 4 while most web hosts still run PHP 4.

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This post was written by On Friday, July 6th, 2007 at 11:38 amand is filed under Community, PHP. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

  • Wim

    Webhosts CAN upgrade their servers to run PHP4 en 5 side by side, by means of running at least one of them as fast-cgi module. It would be good if PHP.net spelled out this upgrade path to help break the loop you sketch.

    Sadly, so far there’s mostly silence over there and here and there some remnants of the old myth that cgi-mode is vastly inferior to mod_php. With the progress made in the field of fast-cgi and the additional safety cgi mode offers for the users of shared servers, it may well be that cgi mode is actually the superior solution for shared web hosts nowadays.

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