Question

I need a definition for a macro-like string in php which would literally be interpreted as this string, but I need is to refer to the line and file where the string is placed rather than my defs.php file…

define ("REDIRECT_FROM"," (".`____FILE____`." line:".`____LINE____`.")");

redirectTo("login.php",REDIRECT_FROM);

would result as:

redirected from abc.php line: 59

Hope I was clear. (the redirected from is implemented in the redirectTo() function of course)

Thanks!

Answer 1

You can’t do this with define() – it sets constants, not macros.

A possible solution is using a function and a backtrace:

function called_from(){
  $trace = debug_backtrace();
  $item = $trace[0];
  return " ({$item['file']} line:{$item['line']})";
}

You would then call:

redirectTo("login.php", called_from());

You could also just build this logic into your redirectTo() function.

An example: http://codepad.org/CGUXWgAB