Updating Magento CMS Pages

update_cms_page.php

/** @var Mage_Cms_Model_Page $oMagePageModel */
$oMagePageModel = Mage::getModel('cms/page');

foreach ($aHomePageTeaserContent as $iStoreId => $sHomePageTeaserContent) {
    $iPageId = $oMagePageModel->checkIdentifier('home', $iStoreId);
    $oPage   = $oMagePageModel->load($iPageId);

    $sPagePrevContent = $oPage->getContent();
    $oPage->setData('stores', array($iStoreId));
    $oPage->setContent($sPagePrevContent . $sHomePageTeaserContent)->save();

    $oPage->clearInstance();
}