Magento clean cms blocks

cms_fix.php

<?php

require_once 'abstract.php';

class X043_Shell_CMSFixer extends Mage_Shell_Abstract {

    public function getCollection() {
        return Mage::getModel('cms/block')->getCollection();
    }
    
    protected function _getPattern($url) {
        $_url = str_replace('/', '\/', str_replace('.', '\.', rtrim($url, '/')));
        return array(
		    array(
		        str_replace('{{BASE_URL}}', $_url, '/"{{BASE_URL}}\/media\/(.+?)"/i'),
		        str_replace('{{BASE_URL}}', $_url, '/"{{BASE_URL}}\/skin\/(?:.+?)\/(?:.+?)\/(?:.+?)\/(.+?)"/i'),
		        # str_replace('{{BASE_URL}}', $_url, '/"{{BASE_URL}}"/i')
		    ),
            array(
                '"{{media url="$1"}}"',
                '"{{skin url="$1"}}"',
                # '"{{store url=""}}"'
            )
		);
    }

	/**
	 * Run script
	 * 
	 * @return void
	 */
	public function run() {
	    umask(0);
		Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
		setlocale(LC_ALL, 'en_US.UTF-8');
		
		$use_ssl = True;
		$envs = array(
		    'dev',
		    'test',
		    'staging'
		);
		

		$base_urls = array();
        foreach (Mage::app()->getStores() as $_storeId => $_) {
            $base_urls[] = Mage::app()->getStore($_storeId)->getBaseUrl();
        }
        
        if($use_ssl) {
            $_base_urls = array();
            foreach($base_urls as $base_url) {
                $_base_urls[] = str_replace('https://', 'http://', $base_url);
            }
            $base_urls = array_merge($base_urls, $_base_urls);
        }
        
        $base_urls = array_unique($base_urls);
        
        $_base_urls = array();
        foreach($base_urls as $base_url) {
            foreach($envs as $env) {
                $_base_urls[] = str_replace('www', $env, $base_url);
            }
        }
        $base_urls = array_unique(array_merge($base_urls, $_base_urls));
		
        foreach($this->getCollection() as $block) {
            $_block = Mage::getModel('cms/block')->load($block->getId());
            $_content = $_block->getData('content');
            
            foreach($base_urls as $base_url) {
                list($pattern, $replacement) = $this->_getPattern($base_url);
                $_content = preg_replace($pattern, $replacement, $_content);
            }
            
            if($_block->getData('content') != $_content) {
                $_block->setData('content', $_content);
                $_block->save();
            }
        }
	}
}

$shell = new X043_Shell_CMSFixer();
$shell->run();