How can I get the call stack from a Fatal Error?

Question

I'm getting a fatal "Call to a member function on a non-object" error in a PHP script, but I'm unable to track down exactly where this is happening, or why. The error message is pretty-much useless, as the line it describes works 99.9% of the time.

Is there a way I can get the current call stack, trace what calls are being made before this fatal error, or do anything else to help track down this bug?

score 5 · Accepted Answer · answered Sep 19 '09 at 13:15

5

I would recommend installing Xdebug on your development server. It's a very valuable tool in cases like these.

answered Sep 19 '09 at 13:15

Jani Hartikainen

42,745
10
68
86

score 0 · Answer 2 · answered Sep 19 '09 at 12:57

0

Use this at the previous line of error:

var_dump(debug_trace);

answered Sep 19 '09 at 12:57

Cem Kalyoncu

14,120
4
40
62

2
you can use
```
 tags to improve your output.
```
– Cem Kalyoncu Sep 19 '09 at 12:58

score 0 · Answer 3 · edited May 23 '17 at 12:22

0

please see my answer and others also for various possibilities

How do I catch a PHP Fatal Error

Obviously this is partially related in a sense it catches only fatal error . You can modify the function to catch other type of errors . The starting point for this is :

if($error['type'] == 1){

This methods overrides Xdebug output if setup already .

regards sakhunzai

edited May 23 '17 at 12:22

Community

1
1

answered May 26 '11 at 04:29

sakhunzai

13,900
23
98
159

score -2 · Answer 4 · answered Sep 19 '09 at 21:21

-2

Use debug_print_backtrace() - http://us2.php.net/manual/en/function.debug-print-backtrace.php

answered Sep 19 '09 at 21:21

grantwparks

1,124
9
13

2

This doesn't seem to work for fatal errors. You can register a shutdown function which runs when the fatal error appears, but at this point the callstack is already cleared and the only thing you'll se in the callstack is your own shutdown handler. – Sam Jan 31 '11 at 10:47

How can I get the call stack from a Fatal Error?

4 Answers4

Linked