public function getClass($classname)
    {
        if ((string) $classname == '' || !array_key_exists($classname, $this->classes)) {
            throw new ImageClassNotRegisteredException($classname);
        }
        return $this->classes[$classname];
    }
public function getClass($classname)
    {
        if ((string) $classname == '' || !array_key_exists($classname, $this->classes)) {
            throw new ImageClassNotRegisteredException($classname);
        }
        return $this->classes[$classname];
    }
public function getClass ( $ classname ) { if ( ( string ) $ classname == '' || ! array_key_exists ( $ classname , $ this -> classes ) ) { throw new ImageClassNotRegisteredException ( $ classname ) ; } return $ this -> classes [ $ classname ] ; }
Get a ResponsiveImageClass by it's name

@param string $classname
@return ResponsiveImageClass
Get a ResponsiveImageClass by it s name