CS file check in autoloader

case sensitive file check autoloader.php

<?php
    private static function _checkClassPath($path)
    {
        if (basename(realpath($path . '.php')) !== $path . '.php')
            throw new CException("Class name does not match file name.");
    }

    /**
     * Class autoload loader.
     * This method is provided to be invoked within an __autoload() magic method.
     * @param string $className class name
     * @return boolean whether the class has been loaded successfully
     */
    public static function autoload($className)
    {
        // use include so that the error PHP file may appear
        if(isset(self::$classMap[$className]))
        {
            include(self::$classMap[$className]);
            if (YII_DEBUG)
                self::_checkClassPath(self::$classMap[$className]);
        }
        else if(isset(self::$_coreClasses[$className]))
        {
            include(YII_PATH . self::$_coreClasses[$className]);
            if (YII_DEBUG)
                self::_checkClassPath(YII_PATH . self::$_coreClasses[$className]);
        }
        else
        {
            // include class file relying on include_path
            if(strpos($className,'\\')===false)  // class without namespace
            {
                if(self::$enableIncludePath===false)
                {
                    foreach(self::$_includePaths as $path)
                    {
                        $classFile=$path.DIRECTORY_SEPARATOR.$className.'.php';
                        if(is_file($classFile))
                        {
                            include($classFile);
                            if (YII_DEBUG)
                                self::_checkClassPath($classFile);
                            break;
                        }
                    }
                }
                else
                {
                    include($className . '.php');
                    if (YII_DEBUG)
                        self::_checkClassPath($className . '.php');
                }
            }
            else  // class name with namespace in PHP 5.3
            {
                $namespace=str_replace('\\','.',ltrim($className,'\\'));
                if(($path=self::getPathOfAlias($namespace))!==false)
                {
                    include($path . '.php');
                    if (YII_DEBUG)
                        self::_checkClassPath($path . '.php');
                }
                else
                    return false;
            }
            return class_exists($className,false) || interface_exists($className,false);
        }
        return true;
    }