写了一个PHP的String类

PHP String 类，暂时只有encode,decode方法：

 使用方法：

$s = '中国';

$os = new String( $s );

echo $os->decode('gbk') , ' ';

echo $os->decode('gbk')->encode('md5'), ' ';

class String extends stdClass

{

    private $_val = '';

    public function __construct( $str = '' )

    {

        $this->_val = $str;

    }

    

    public function __toString()

    {

        return $this->_val;

    }

    

    public function encode( $coder )

    {

        $coder = 'encode_' . $coder;

        if( method_exists( $this, $coder ) )

        {

            return $this->$coder();

        }else{

            return $this;

        }

    }

    

    public function decode( $coder )

    {

        $coder = 'decode_' . $coder;

        if( method_exists( $this, $coder ) )

        {

            return $this->$coder();

        }else{

            return $this;

        }

    }

    

    private function encode_md5()

    {

        return new String( md5( $this->_val ) );

    }

    

    private function decode_gbk()

    {

        return new String( iconv( 'GBK', 'UTF-8', $this->_val ) );

    }

    

    

}