1Varien_Autoload::register();
2
class Varien_Autoload
static public function register()
{
spl_autoload_register(array(self::instance(), 'autoload'));
}
3
static public function instance()
{
if (!self::$_instance) {
self::$_instance = new Varien_Autoload();
}
return self::$_instance;
}
4
public function __construct()
{
$this->_isIncludePathDefined = defined('COMPILER_INCLUDE_PATH');
if (defined('COMPILER_COLLECT_PATH')) {
$this->_collectClasses = true;
$this->_collectPath = COMPILER_COLLECT_PATH;
}
self::registerScope(self::$_scope);
}
5
self::registerScope(self::$_scope);
}
static protected $_scope = 'default';
6
/**
* Register autoload scope
* This process allow include scope file which can contain classes
* definition which are used for this scope
*
* @param string $code scope code
*/
static public function registerScope($code)
{
self::$_scope = $code;
if (defined('COMPILER_INCLUDE_PATH')) {
@include_once self::SCOPE_FILE_PREFIX.$code.'.php';
}
}
3，4,5,6一些值的赋值，This process allow include scope file which can contain classes
回到2
spl_autoload_register(array(self::instance(), 'autoload'));
self::instance()是Varien_Autoload的实例！
7。
public function autoload($class)
{
if ($this->_collectClasses) {
$this->_arrLoadedClasses[self::$_scope][] = $class;
}
if ($this->_isIncludePathDefined) {
$classFile = $class;
} else {
$classFile = str_replace(' ', DIRECTORY_SEPARATOR, ucwords(str_replace('_', ' ', $class)));
}
$classFile.= '.php';
//echo $classFile;die();
return include $classFile;
}
本质就是，对一些对象变量赋值，有条件的对scope文件加载，然后将__autoload函数覆盖，使用spl_autoload_register函数，
spl_autoload_register(Varien_Autoload，autoload)!!!!
