Magento not working on PHP 5.3

Fatal error: Method Varien_Object::__tostring() cannot take arguments in /magento/lib/Varien/Object.php
Change 1) /lib/Varien/Object.php (Line 484)
Change from
public function ___toString(array $arrAttributes = array(), $valueSeparator=’,')
To this
public function __invoke(array $arrAttributes = array(), $valueSeparator=’,')
Change 2) File /app/code/core/Mage/Core/Controller/Request/Http.php (Line 274)
Change from
$host = split(‘:’, $_SERVER['HTTP_HOST']);
To this
$host = explode(‘:’, $_SERVER['HTTP_HOST']);