Question

I’m using Exlipse with Xdebug to debug my php codes, which works well. But there is one type of codes I can’t debug: callback functions

I’m using preg_replace:

$pc = preg_replace('#\[div(=(.*))?\](.*?)\[/div\]#iuUe', "\bbcode_div('\$2', '\$3')", $_POST["data"]);

which calls the function all right, but the eclipse wont get inside the function while debugging, even with a break point.

How can I make the debugger to get inside that function?

EDIT: I need to use preg_replace.

Answer 1

Make sure you’re using preg_replace_callback():

preg_replace_callback('/ /', 'replace', 'this is not a complicated matter');

function replace($t)
{
   var_dump($t);    // <-- set breakpoint here
}

This brakes five times before calling var_dump().

---

EDIT: Some hackery is required when preg_replace() is used with the e modifier. In this case, setting a breakpoint is not sufficient. You’d have to explicitly tell XDebug to break:

function replace($t)
{
   // Production systems might (should) not have this function
   if (function_exists('xdebug_break'))
   {
      xdebug_break();
   }

   // Rest of the code...
}