<?php 
    require 'image.GD.class.php';
    $img_url = 'image/1.jpg';
    $font_url = 'font/msyh.ttc';
    $source = "image/net.jpg";
    $content = '水印内容';
    $size = 20;
    $color = array(0=>255,1=>255,2=>255,3=>20);
    $local = array('x'=>20,'y'=>50);
    $angle = 10;
    $alpha = 30;
    
    $image = new Image($img_url);  
    $image->fontMark($content, $font_url, $size, $color, $local, $angle);//添加文字水印
    $image->imageMark($source, $local, $alpha);//添加图片水印
    $image->thumb(500,300);//压缩图片
    $image->show();//显示图片
    $image->save('nowimage');//保存图片
?>


image.GD.class.php:

<?php

    class Image{
        private $info;
        private $image;
        public function __construct($img) { //读取图片
            $info = getimagesize($img);
            $this->info = array(
                'width'=>$info[0],
                'height'=>$info[1],
                'type'=>image_type_to_extension($info[2],false),
                'mime'=>$info['mime']
            );
            $fun = "imagecreatefrom{$this->info['type']}";
            $this->image = $fun($img);
        }
        public function thumb($width,$height){ //图片压缩
            $image_thumb = imagecreatetruecolor($width,$height);
            imagecopyresampled($image_thumb,$this->image,0,0,0,0,$width,$height,$this->info['width'],$this->info['height']);
            imagedestroy($this->image);
            $this->image = $image_thumb;
        }
        public function fontMark($content,$font_url,$size,$color,$local,$angle){ //添加文字水印
            $col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]);
            imagettftext($this->image,$size,$angle,$local['x'],$local['y'],$col,$font_url,$content);
        }
        public function imageMark($source,$local,$alpha){ //添加图片水印
            $info2 = getimagesize($source);
            $type2 = image_type_to_extension($info2[2],false);
            $fun2 = "imagecreatefrom{$type2}";
            $water = $fun2($source);
            imagecopymerge($this->image, $water,$local['x'],$local['y'],0,0,$info2[0],$info2[1],$alpha);
            imagedestroy($water);
        }
        public function show(){ //浏览器输出图片
            header("content-type:".$this->info['mime']);
            $func = "image{$this->info['type']}";
            $func($this->image);
        }
        public function save($newname){ //保存图片
            $func = "image{$this->info['type']}";
            $func($this->image,$newname.'.'.$this->info['type']);
        }
        public function __destruct(){ //销毁内存
            imagedestroy($this->image);
        }
    }