php生成透明背景图片实例

//透明背景图片
header(‘content-type:text/html;charset=gbk’);
$safess = $_get[safe];
$dir = dirname(__file__).”/simsun.ttc”;
$safe=iconv(“gb2312″,”utf-8″,$safess);
 $im=imagecreatetruecolor(160,18);
 $color=imagecolorallocate($im,229,231,230);
 imagecolortransparent($im,$color); // 设置为透明色，若注释掉该行则输出上面设置的背景
 imagefill($im,0,0,$color);
 $textcolor=imagecolorallocate($im,0,0,0);
 imagettftext($im,9,0,30,12,$textcolor,$dir,$safe);
 //imagestring($im,30 , 5, 3, $safe, $textcolor);
    header(“content-type:image/png”);
 imagegif($im);
?>