I am new to PHP, but have experience with programming in several other languages (c flavors, basic flavors, FORTRAN, LISP,APL---I think I'm showing my age). We wish to poke around at the code so as to better understand what is going on--seem to have a little problem with the inventory status item not showing results--, but that may be because we modified a field width to get longer inventory locations and we probably missed something.
Can anyone recommend a development environment or debugger to use for debugging the PHP code?