Fatal error: Class 'Zend_Log' not found in Checkout

Question

My checkout page is giving me this error:

Fatal error: Class 'Zend_Log' not found in /home/internat/public_html/app/code/core/Mage/Checkout/Block/Onepage.php on line 98

What could be the problem? The error line is just the last line.

public function getAddressesHtmlSelect($address, $type)
{
    if ($this->isCustomerLoggedIn()) {
        $options = array();
        foreach ($this->getCustomer()->getAddresses() as $a) {
            $options[] = array(
                'value'=>$a->getId(),
                'label'=>$a->getStreet(-1).', '.$a->getCity().', '.$a->getRegion().' '.$a->getPostcode(),
            );
        }

        $addressId = $address->getId();
        if (empty($addressId)) {
            if ($type=='billing') {
                $address = $this->getCustomer()->getPrimaryBillingAddress();
            } else {
                $address = $this->getCustomer()->getPrimaryShippingAddress();
            }
            if ($address) {
                $addressId = $address->getId();
            }
        }

        $select = $this->getLayout()->createBlock('core/html_select')
            ->setName($type.'_address_id')
            ->setId($type.'-address-select')
            ->setExtraParams('onchange="'.$type.'.newAddress(!this.value)"')
            ->setValue($addressId)
            ->setOptions($options);

        $select->addOption('', 'New Address');

        return $select->getHtml();
    }
    return '';
}

Answer 1

The error simply says, Magento couldn't find Zend_Log class inside your application. By default, this class resides in \lib\Zend\Log.php¹. So the first thing that you want to make sure is, this class exist in your magento instance.

But the bigger mistake that I can see here is, there is a Core Hack, which you should never do in Magento. If you want to extend Magento functionality, you should either do a rewrite or if possible, use an event handler.

In this case, default Mage_Checkout_Block_Onepage class do not have a method getAddressesHtmlSelect(), but it's parent class (Mage_Checkout_Block_Onepage_Abstract) has one. So I doubt someone is trying to modify it's parent class method behaviour by directly putting the method inside Mage_Checkout_Block_Onepage. This is completely wrong.

I am enforcing the point. "In order to do this, you should either use any event handler or rewrite the class Mage_Checkout_Block_Onepage".

Note : We can't see any Zend_Log class usage in the provided code. So further help is not possible, if you didn't provide more details.

---

¹ - Zend Log class