$dst_path = "dst.jpg";

//建立圖片的例項

$dst = imagecreatefromstring(file_get_contents($dst_path));

//打上文字

$font = "./simsun.ttc";//字型

$black = imagecolorallocate($dst, 0x00, 0x00, 0x00);//字型顏色

imagefttext($dst, 13, 0, 20, 20, $black, $font, "快樂程式設計");

//輸出圖片

list($dst_w, $dst_h, $dst_type) = getimagesize($dst_path);

switch ($dst_type) {

case 1://GIF

header("Content-Type: image/gif");

imagegif($dst);

break;

case 2://JPG

header("Content-Type: image/jpeg");

imagejpeg($dst);

break;

case 3://PNG

header("Content-Type: image/png");

imagepng($dst);

break;

default:

break;