How to Set Store Config (system configuration)

Question

We can get system configuration values using

Mage::getStoreConfig($xmlPath);

But how can we set such configuration field programatically? I would expect some method like

Mage::setStoreConfig($xmlPath, $val);

But the closest thing I'm seeing is

Mage::app()
 ->getStore()
 ->setConfig($xmlPath, $val);
 ->save();

But this is not updating the config value. Thanks for your time and help.

Answer 1

This should work

/*
*turns notice on
*/
Mage::getConfig()->saveConfig('design/head/demonotice', '1', 'default', 0);
/*
*turns notice off
*/
Mage::getConfig()->saveConfig('design/head/demonotice', '0', 'default', 0);

class Mage_Core_Model_Config
{
 /**
 * Save config value to DB
 *
 * @param string $path
 * @param string $value
 * @param string $scope
 * @param int $scopeId
 * @return Mage_Core_Store_Config
 */
 public function saveConfig($path, $value, $scope = 'default', $scopeId = 0)
 {
 $resource = $this->getResourceModel();
 $resource->saveConfig(rtrim($path, '/'), $value, $scope, $scopeId);
 return $this;
 }
}