I have noticed that PHP 5.2 is officially recommended for Drupal 5 and 6. But as the 'System Requirement' page needs update, I am wondering what would be the anticipated problems using Drupal 5.3.

I have been using PHP 5.3.2 + FPM on a Drupal 6.22 site, and have some JavaScript issues with the Voting UP/Down and Poll modules. Is it possible that I can resolve these by downgrading PHP to 5.2?

1 Answer 1


Drupal 6.22 is compatible with PHP 5.3, but some contributed modules may not support 5.3. That said, I have been developing D6 sites on 5.3 for more than a year without any problems.

Usually, the PHP version is not the cause of JS problems, so I would start to look for the solution elsewhere (Firebug?).

  • Thanks. What are the incompatible modules with php 5.3?
    – alfish
    Sep 3, 2011 at 18:57
  • 1
    If php is erroring out or generating some warnings on a ajax callback, it may indeed be affecting ajax-heavy modules like vote up/down.
    – Entendu
    Sep 3, 2011 at 19:09
  • @Entendu How this Ajax-related errors can be resolved?
    – alfish
    Sep 3, 2011 at 21:02
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    There isn't really a list of modules problematic with 5.3. Watch the AJAX transfer w/ Firebug. Often, you see a PHP message come back as the response instead of the JSON if it is a 5.2 vs 5.3 problem.
    – mpdonadio
    Sep 3, 2011 at 21:09

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