Sorted:

problem about autoload-Collection of common programming errors

Magento undefined constant-Collection of common programming errors

Instantiate dynamic array Magento-Collection of common programming errors

Magento Fatal error: Call to undefined method Mage_Catalog_Helper_Product::initProductLayout()-Collection of common programming errors

problem about where-Collection of common programming errors

problem about varnish-Collection of common programming errors

codeigniter modular seperation problem php mvc-Collection of common programming errors

EAV and DataTypes-Collection of common programming errors

problem about entity-attribute-value-Collection of common programming errors

problem about apc-Record and share programming errors