Script breaks connection?

I have a scripts, which, when runs, breaks the connection to Apache and I have no idea why. This script has lots of function calls, some return large arrays. After I've trim the scripts to the point where it connects and run, if I add a printf("Hello World") or any custom function I get this error: >> Connection to host localhost is broken << Is there a max number of functions that can be called or some other kind of limit that can affect it? I've compiled php 4 into apache on Linux. This is not the first time it happens, it happened before when I transfered a php file from another server to this one. It worked fine on the other server but I got connection broken when ran a specific file on this server. Please help