Retrieves attribute codes by the attribute group name

Magento - Get attributes by attribute group

$setId = $_product->getAttributeSetId(); // Attribute set Id
$groups = Mage::getModel('eav/entity_attribute_group')
    ->getResourceCollection()
    ->setAttributeSetFilter($setId)
    ->setSortOrder()
    ->load();

$attributeCodes = array();
foreach ($groups as $group) {
    if($group->getAttributeGroupName() == 'Somename'){ // set name
    //$groupName          = $group->getAttributeGroupName();
    //$groupId            = $group->getAttributeGroupId();

    $attributes = Mage::getResourceModel('catalog/product_attribute_collection')
        ->setAttributeGroupFilter($group->getId())
        ->addVisibleFilter()
        ->checkConfigurableProducts()
        ->load();
        if ($attributes->getSize() > 0) {
            foreach ($attributes->getItems() as $attribute) {
                /* @var $child Mage_Eav_Model_Entity_Attribute */
                $attributeCodes[] = $attribute->getAttributeCode();                     
            }
        } 
  }
}
print_r($attributeCodes);