This is a common problem I see in failed mod installs: incorrectly renaming files you wish to keep as backups. Zen Cart automatically loads all files ending with the extension “.php” in certain directories (such as includes/functions/extra_functions and includes/modules/order_totals), so you must name your backup files in a way such that they do not end with the extension “.php”.
For example: suppose you want to save a backup copy of the file ot_coupon.php
Good names:
ot_coupon.php.5Oct10
ot_coupon.php.orig
ot_coupon.php.old
Bad Names
5Oct10.ot_coupon.php
orig-ot_coupon.php
old.ot_coupon.php
Amen to this bit of knowledge! I just spent the better part of a day trying to figure out why a recent addon not only failed and crashed parts of the cart, but then continued to cause problems after it was “removed” — I really didn’t remove it,just renamed some of the files in the incorrect manner.
Comment by John — Friday, December 2, 2011 @ 5:21 pm