1-wrapper.php

function arrayToObject_recursive ( $data ) {
	// if the passed data is just a value, return it, and terminate the recursion.
	if ( !is_array( $data ) )
		return $data; 

	// otherwise, read the class name out of the data.
	if ( array_keys($data) !== range(0, count($data) - 1) ) {
		
		if ( !empty( $data['_model_class'] ) ) {
			$class = $data['_model_class'];
		} else {
			$class = "stdClass";
		} 
		

		// instantiate an object of the found class.
		$result = new $class;
		// then recursively parse it's values, and add them as fields on the object.
		foreach ($data as $key => $value) 
			$result->$key = arrayToObject_recursive( $value );
	}else{
		// if no class name could be found, treat it as just a raw array.
		$result = array();
		// then recursively parse it's values, and add them as fields on the object.
		foreach ($data as $key => $value) 
			$result[$key] = arrayToObject_recursive( $value );
	}

	// finally, return the structure.
	return $result;
}

2-test-cases.php

$arr1 = array(
	"foo" => "bar",
	"bar" => Array("foo", "bar"),
	"barfoo" => Array("foo" => "bar", "bar" => "foo"),
	"_model_class" => "stdClass"
);

$arr2 = array(
	"foo" => "bar",
	"bar" => Array("foo", "bar"),
	"barfoo" => Array("foo" => "bar", "bar" => "foo"),
);


$object1 = arrayToObject_recursive($arr1);
$object2 = arrayToObject_recursive($arr2);

var_dump($object1->foo);
var_dump($object1->bar[0]);
var_dump($object1->barfoo->bar);
echo(get_class($object1));

var_dump($object2->foo);
var_dump($object2->bar[0]);
var_dump($object2->barfoo->bar);
echo(get_class($object2));