Running OS Commerce on PHP5

Day two at the new job. My first tasks involve making some customisations to an OS Commerce installation and, as ever, I hate to work on live servers. I just spent an hour or so downloading the live application, but of course I’ve installed Dexter’s PHP5.1 with MySQL4.1 and Apache2. OS Commerce is written for PHP4.

The home page loaded fine, but heading to the admin page, I get “Fatal error: Cannot re-assign $this in …/admin/includes/classes/upload.php on line 31”. I figured that I’d document the changes required to get this running on PHP5 so that I can refer to it again later, and maybe help a few others out.

Fixing the $this re-assignment

First job is to get rid of that error. Looking at line 31 in /admin/includes/classes/upload.php I see:

// self destruct
$this = null;

For now, I’m just going to comment this out and see if there are any undesirable consequences as I test the system. Bingo - admin system works now.

Well I never - it works. Hardly seems worth posting this. In order to make this post a little more useful, I tried to see if anyone else has done this and found a thread on webmasterworld. This person seems to have found problems with the navigation object, but I can’t reproduce that. No errors here. Another thread covering this issue might also be useful to you.

[Update: 19 Oct @ 15:20]

It seems there is something else. When using the admin area, trying to add tax zones, I got an SQL error: “You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘-20, 20’ at line 1”.

Seems the paging code doesn’t work well in PHP5, and a thread on the oscommerce forum gives one solution: if the offset goes below zero, set it to zero. So on line 38 of admin/includes/classes/split_page_results.php and line 66 of includes/classes/split_page_results.php, add:

if ($offset < 0) $offset=0;

As is the poster of this tip, I’m unsure how this will cope with pages 2 and later when paging. I’ll update this if I find another problem.

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