PHP 4.0 Bug #5192: opendir fails in 4.0.0 where 3.0.12 worked

From: whit@transpect.com Operating system: Linux PHP version: 4.0.0 Release PHP Bug Type: Misbehaving function Bug description: opendir fails in 4.0.0 where 3.0.12 worked I haven't had time to fully diagnose this, because the PHP site said "Upgrade to 4, there are very few incompatibilities." So I tried it on a busy day, and ran into a major incompatibility (from my perspective). There are a number of scripts where I have statements like "opendir("$docroot/$pgfrom");", where $docroot is an absolute path given at the top of the file, and $pgfrom is a subdirectory with a name derrived referring page. In php4, this statement produces an error, to the effect that "1 is not a valid" something-or-other - I didn't look long at it because this is a production system, and I had to revert to php3 before users started seeing all the broken pages. Now this could be paranoia in php4 on what directories can be openned, or it could be failure to handle the string concatenation of "$docroot/$pgfrom" the same way (is it performing division on the two text strings and deciding the result is "1"?) ... or something else. Whatever it is, it's incompatible with php3, and this should be listed in the incompatibilities file, along with the programming change(s) required to not break scripts expecting the old behavior. And until stuff like this is fully documented, you shouldn't be advising everyone to hurry up and upgrade, imho - or at least warning folks to be thorough about backing up old files, because of the likelihood of unexpected incompatibilities. 4 does look faster though!