[development] selenium test

[David Strauss]

Doug Green wrote:
> The way I track these down is using xdebug2.  There's a function called
> xdebug_get_function_stack that prints the function stack.
> Edit bootstrap.inc and put this code at the top of check_plain (the
> function that's really getting the error), it will print the function
> stack out when you would get the error:
> 
>  if (is_array($text)) {
>    print_r(xdebug_get_function_stack());
>  }
> 
> Of course, it means that you have to get xdebug installed and working,
> and this might take a bit of an effort.

You don't need xdebug to print a backtrace in PHP:

debug_backtrace()

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