Description:
------------
on a 64bit system the following 
var_dump(1%4294967295);
should return 1, but returns 0. 
The problem is in the 
ZEND_API int mod_function(...) in zend_operators.c

A call is made to abs which expects a 32bit int and returns a 32bit int, but 4294967295 is > 32 bits in size so the abs call returns an incorrect value.

A proposed fix is to change the line
"if (abs(op2->value.lval) == 1) {"
to
"if (op2->value.lval == 1 || op2->value.lval == -1) {"