php绘制中文的乱码有关问题

php绘制中文的乱码问题

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?php //    1.        $img=imagecreatetruecolor(400,400);                $white=imagecolorallocate($img, 255, 255, 255);        $gray=imagecolorallocate($img, 0xC0, 0xC0, 0xC0);        $darkgray=imagecolorallocate($img, 0x90, 0x90, 0x90);        $navy=imagecolorallocate($img, 0, 0, 0x80);        $darknavy=imagecolorallocate($img, 0, 0, 0x50);        $red=    imagecolorallocate($img, 0xFF, 0, 0);        $darkred=imagecolorallocate($img, 0x90, 0, 0);                //     2.        imagefill($img,0,0,$red);                imagettftext($img,20,-60,60,150,$darknavy,"simhei.ttf","一二三");                                //     3.        header("Content-Type:image/gif");        imagegif($img);        //     4.        imagedestroy($img);        

  "一二三"无法显示，只有几个方框，怎样解决乱码问题?先谢谢!!!

------解决方案--------------------
imagettftext($img,20,-60,60,150,$darknavy,"simhei.ttf", iconv('gbk', 'utf-8', "一二三") );