get system config data in website,store and default scope

Question

I have created the custom groups and fields under System->Configuration->Design I used the below event.

<admin_system_config_changed_section_design>
    <observers>
        <custom>
            <type>singleton</type>
            <class>Custon_Custom_Observer</class>
            <method>save</method>
            </custom>
    </observers>
</admin_system_config_changed_section_design>

There are three types of scope in magento.

1) Default

2) Websites

3) Stores

I want all the values of my custom fields in admin panel to store the values in custom table.

for example, you get description field value in store level.

Mage::getStoreConfig('design/custom/description');

I want the above value in website level and current store level. I have tried this link

Answer 1

In config.xml,

 <global>
    <events>
        <admin_system_config_changed_section_design>
            <observers>
                <custom>
                    <type>singleton</type>
                    <class>Custon_Custom_Observer</class>
                    <method>saveSystemConfig</method>
                    </custom>
            </observers>
        </admin_system_config_changed_section_design>
    </events>
 </global>

In observer.php,

public function saveSystemConfig(Varien_Event_Observer $observer)
{
    $postData = $observer->getEvent()->getData();

    if (is_null($postData['store']) && $postData['website']) //check for website scope
    {
        $scopeId = Mage::getModel('core/website')->load($postData['website'])->getId();
        $description  = Mage::app()->getWebsite($scopeId)->getConfig('design/custom/description');
        $currentScope = 'websites';
    }
    elseif($postData['store']) //check for store scope
    {
        $scopeId =   Mage::getModel('core/store')->load($postData['store'])->getId();
        $description  = Mage::app()->getStore($scopeId)->getConfig('design/custom/description');
        $currentScope = 'stores';
    }
    else //for default scope
    {
        $scopeId = 0;
        $description  = Mage::getStoreConfig('design/social-meta-tags/design/custom/description')
        $currentScope = 'default';
    }
}

From the above you can get individual field values in all scopes.