For this, I suggest using the data
folder of one of your custom modules.
Let's say that the module is currently at version 1.0.4
.
Create the file data/[module]_setup/data-upgrade-1.0.4-1.0.5.php
with the following content:
Edit: changed file name
$content = 'BLOCK CONTENT HERE';
//if you want one block for each store view, get the store collection
$stores = Mage::getModel('core/store')->getCollection()->addFieldToFilter('store_id', array('gt'=>0))->getAllIds();
//if you want one general block for all the store viwes, uncomment the line below
//$stores = array(0);
foreach ($stores as $store){
$block = Mage::getModel('cms/block');
$block->setTitle('Block title here');
$block->setIdentifier('block_identifier_here');
$block->setStores(array($store));
$block->setIsActive(1);
$block->setContent($content);
$block->save();
}
After this just change the version in config.xml
to 1.0.5
clear the cache and refresh any page.