Array of functions

I was wondering if it's OK if I store a set of functions into a array like this

$f = array(
   'functions1' =>
     array(
      'somefunction',
       array($this, 'someclassfunction'),
       array($this, 'someotherfunction'),
     ),
   'functions2' =>
     array(
      'somefunction',
       array($this, 'someclassfunction'),
       array($this, 'someotherfunction'),
     ),

   ...

);

and call them later like:

foreach($f as $key => $func)
  call_user_func($func)...

If I do a print_r($f) I get a huge array with lots variables from all these functions. Does this affect performance somehow?

If $f is really big, it'll consume your RAM. print_r actually prints object properties as well. I can see you use $this multiple times, and that's likely why your output is huge. The PHP documentation reads:

print_r(), var_dump() and var_export() will also show protected and private properties of objects with PHP 5. Static class members will not be shown.

$this is only represented once in memory though, i.e. the performance overhead is low.

call_user_func itself isn't as fast as calling the function directly though.