<?php
 /**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2015/6/29
 * Time: 22:27
 */
 $img = imagecreatefromjpeg('face.jpeg');//根據已有的JPG創建image
 header('Content-type:image/jpeg');//設置mime type
 imagestring($img,5,5,5,'Vito-L',imagecolorallocate($img,255,0,0));//生成水印,imagestring(圖片,字體,位置x,位置y,字符串,顏色)
 imagejpeg($img);//輸出圖片
 //整幅圖像的左上角為 0,0