【www.gdgbn.com--php函数】

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 ) );
}
}

$s ="中国";
$os = new String( $s );
echo $os->decode("gbk") ,"";
echo $os->decode("gbk")->encode("md5"),"";

本文来源：http://www.gdgbn.com/jiaocheng/24240/