Zend API comparison

Hi internals, I'm currently experimenting with simple type comparison but I'm not very familiar with the zend api. I thought it would be enough to manipulate the compare functions of "Zend/zend_operators.c" but I ran into two issues: 1. Can't find out how ">" / ">=" will be handled 2. I ran into a straight behavior if a FAILURE will be returned. I thought it means no comparable - all expect of "!=" the result will be FALSE. 3. It looks like on comparing resources the function "compare_function" will be called without any of the "is_[not]_equal_function" It would be very great if someone could help me out a little bit. I'm new to the list so if this isn't the right list to ask please direct me to the right list. Greetings Marc