What is wrong in this resize() function?

[eluser]chefnelone[/eluser]
[quote author="Jeroen Schaftenaar" date="1282140089"]Also enable php error output in the ini file or using

Code:

ini_set('display_errors', 1);

[/quote]
thanks jeroen

In php.ini I set:

Code:

display_errors = On

I still get a blank page.

Where (which file) do I set: ini_set('display_errors', 1) ?