sylvest

I've tried this now. It gives me details of the current function (i.e. the function inside which I've put the debug_backtrace() call), along with the values of the parameters, but I already know all of that (by putting print statements at appropriate places in the function). It didn't show me what I really wanted to know, which is where is this function called from on each invocation. Does anyone know why not? I found another useful-looking function, debug_print_backtrace(), but this does not seem to be implemented in the version of PHP that tch is running . Any other ideas??? Thanks - Rowan

Thanks to everyone who has replied with useful advice. I will try debug_backtrace, which may help me with my current problem. I wasn't aware of this function. I can see the sense of trying to debug this stuff on a local server before up-loading it, but to be a worthwhile test/debug environment I guess I'd have to have the same or similar versions and configurations of PHP, MySQL, Zend and maybe lots of other things which are running on TCH, and that's gonna take me a long time to learn. I was hoping that I'd be able to debug it running "for real" on TCH, and in fact I've made quite a lot of progress before running into my current problem. Are there any other tools or functions (in addition to debug_backtrace) that I ought to know about which can help in debugging PHP code without root access? Or any tutorials or white papers on this? Thanks all for your help. Rowan

I need some guidance on debugging PHP scripts. I am fairly new to PHP. I'm trying to modify a fairly large PHP application and I've reached a point where I can't work out what the existing code is doing. Is there some way of inserting something into the script which will print out a call or stack trace of the functions (and maybe parameters) which have got me to this point? What PHP debugging tools are available? I see that there are things like "Advanced PHP Debugger" - are any of these installed by default on TCH? If not, can I install one just for my account? Where do I find more information? Many thanks - Rowan