PHP - usort(): Array was modified by the user comparison function

Question

I have a web application that runs fine on our Linux servers but when running on Mac OS with the Zend Community Edition Server using PHP 5.3 we get the error "usort(): Array was modified by the user comparison function " every time a page loads for the first time (it takes about 2 minutes for a page to tick over and load, on the linux servers the page loads in 1 second).

Has anyone else experienced this or has any idea how I can fix the problem, I have tried playing around with PHP and Apache memory settings with no luck.

Thanks in advance

Answer 1

What version of PHP is on the linux box?

Are the error_reporting levels the same on both boxes? Try setting them both to E_ALL.

The warning is almost certainly not lying. It's saying that the comparison function you're passing to usort() is changing the array that you're trying to sort - that could definitely make usort take a long time, possibly forever!

My first step would be to study the comparison function, and figure out why that's happening. It's possible that if the linux boxes are using a pre-5.3 version, there is some difference in the behavior of some language function used in the comparison function.

Answer 2

This issue was resolved by moving from Zend Server CE to XAMPP. Seems to be a Zend Server CE problem.