recursive code to iterate the stdClass object

<?php
   // Create new stdClass Object
	$init = new stdClass;

	// Add some test data
	$init->foo = "2019-02-15T11:12:28";
	$init->bar = new stdClass;
	$init->bar->baaz = "Testing&nbsp<the";
	$init->bar->fooz = new stdClass;
	$init->bar->fooz->baz = "Testing<> again";
	$init->foox = "Just<> test";

	
	
	
	function clean($string) {
      return preg_replace("/[^a-zA-Z0-9_\s]/", "", $string);
    }
	function striploop($obj){
	    $stipfields=['FirstName','LastName','MailingStreet','MailingCity'];
    	foreach($obj as $key => $item) {
           
            if(is_object($item) || is_array($item))
            striploop($item);
            if(is_string($item) && in_array($key,$stipfields))
            $obj->$key=clean($item);
          }
      
      return $obj;
	}
	
	// Print objects and array
	print_r(striploop($init));