别人整理的，偷偷转载下，原文地址https://blog.csdn.net/liuzp111/article/details/53337787
<?php
/**
* 图片加水印类，支持文字水印、透明度设置、自定义水印位置等。
* 使用示例：
* $obj = new WaterMask($imgFileName); //实例化对象
* $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
* $obj->$transparent = 45; //水印透明度
* $obj->$waterStr = 'icp.niufee.com'; //水印文字
* $obj->$fontSize = 18; //文字字体大小
* $obj->$fontColor = array(255,255,255); //水印文字颜色（RGB）
* $obj->$fontFile = 'AHGBold.ttf'; //字体文件
* ……
* $obj->output(); //输出水印图片文件覆盖到输入的图片文件
* @modify liuzp111
*/
class WaterMask{
public $waterTypeImage = false; //水印类型：启用图片水印
public $waterTypeStr = false; //水印类型：启用文字水印
public $pos = 0; //水印位置
public $transparent = 45; //水印透明度(0---100)数值越大越不透明
public $waterStr = 'icp.niufee.com'; //水印文字
public $fontSize = 14; //文字字体大小
public $fontColor = array(0,0,0); //水印文字颜色（RGB） 默认黑色
public $fontFile = './font/simfang.ttf'; //字体文件
public $waterImg = 'logo.png'; //水印图片
private $srcImg = ''; //需要添加水印的图片
private $im = ''; //图片句柄
private $water_im = ''; //水印图片句柄
private $srcImg_info = ''; //图片信息
private $waterImg_info = ''; //水印图片信息
private $str_w = ''; //水印文字宽度
private $str_h = ''; //水印文字高度
private $x = ''; //水印X坐标
private $y = ''; //水印y坐标
public $output_img = ''; //存储输出图片到哪里
public $is_draw_rectangle = false; //是否绘制矩形区域 （暂不支持自定义位置）
//public $rectange_color = ''; //绘制矩形区域的颜色
private $result_array = array(); //结果数组
public function __construct($img) { //析构函数
//$this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
if(file_exists($img)){
$this->srcImg = $img;
}else{
return array('data'=>'','info'=>'源文件不存在!','status'=>0);
}
}
private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
$this->srcImg_info = getimagesize($this->srcImg);
switch ($this->srcImg_info[2]) {
case 3:
$this->im = imagecreatefrompng($this->srcImg);
break 1;
case 2:
$this->im = imagecreatefromjpeg($this->srcImg);
break 1;
case 1:
$this->im = imagecreatefromgif($this->srcImg);
break 1;
default:
//die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
return array('data'=>'','info'=>'原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。','status'=>0);
}
}
private function waterimginfo() { //获取水印图片的信息，并载入图片。
$this->waterImg_info = getimagesize($this->waterImg);
switch ($this->waterImg_info[2]) {
case 3:
$this->water_im = imagecreatefrompng($this->waterImg);
break 1;
case 2:
$this->water_im = imagecreatefromjpeg($this->waterImg);
break 1;
case 1:
$this->water_im = imagecreatefromgif($this->waterImg);
break 1;
default:
//die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
return array('data'=>'','info'=>'水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。','status'=>0);
}
}
private function waterpos() { //水印位置算法
switch ($this->pos) {
case 0: //随机位置
$this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
$this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
break 1;
case 1: //上左
$this->x = 0;
$this->y = 0;
break 1;
case 2: //上中
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = 0;
break 1;
case 3: //上右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = 0;
break 1;
case 4: //中左
$this->x = 0;
$this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
break 1;
case 5: //中中
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
break 1;
case 6: //中右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
break 1;
case 7: //下左
$this->x = 0;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
case 8: //下中
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
case 9: //下中偏上100px
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1] - 100;
break 1;
default: //下右
$this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
break 1;
}
}
/**
* 水印文字图片位置，根据需求调整
*/
private function waterposStr() {
$this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
$this->y = $this->srcImg_info[1]-$this->waterImg_info[1] - 3;
}
private function waterimg($type='') {
if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
//die('水印比原图大！');
return array('data'=>'','info'=>'水印比原图大!','status'=>0);
}
if($type == 'waterstr'){
$this->waterposStr();
}else{
$this->waterpos();
}
$cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
$pct = $this->transparent;
imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
}
private function waterstr() {
$rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
$w = abs($rect[2]-$rect[6]);
$h = abs($rect[3]-$rect[7]);
$fontHeight = $this->fontSize;
$this->water_im = imagecreatetruecolor($w, $h);
imagealphablending($this->water_im,false);
imagesavealpha($this->water_im,true);
$white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
imagefill($this->water_im,0,0,$white_alpha);
$color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
$this->waterImg_info = array(0=>$w,1=>$h);
$this->waterimg($type='waterstr');
}
/**
* 绘制矩形区
* bool imagefilledrectangle ( resource $image , int $x1 , int $y1 , int $x2 , int $y2 , int $color )
* bool imagerectangle ( resource $image , int $x1 , int $y1 , int $x2 , int $y2 , int $col )
* @author liuzp111
*/
public function drawRectangle()
{
//imagefill($im,0,0,$gray);//填充资源，填充的坐标（类似PS魔棒），颜色
/*
* 1--------------画长方形--------------
* bool imagerectangle ( resource $image , int $x1 , int $y1 , int $x2 , int $y2 , int $col )
* 参数: 画布资源, 左上角x坐标,左上y坐标,右下x坐标,右下y坐标,颜色
*/
$color = imagecolorallocate($this->im,255,255,255);//创建矩形边框颜色和填充颜色
//=========================================================================
//绘制矩形区域并填充
// 参数说明：
//bool imagefilledrectangle ( resource $image , int $x1 , int $y1 , int $x2 , int $y2 , int $color )
// im:为将图像载入为图像资源
// $x1:表示矩形左上角的X坐标
// $y1:表示矩形左上角的Y坐标
// $x2:表示矩形右下角的X坐标
// $y2:表示矩形右下角的Y坐标
// $color:为填充的RGB颜色
//
imagefilledrectangle($this->im,3,$this->srcImg_info[1] - 20,$this->srcImg_info[0]-3,$this->srcImg_info[1]-3,$color);
//不要使用下方的函数填充，下方填充函数为魔棒填充，容易导致填充不完整
//imagefill($this->im,$this->srcImg_info[0]/2,$this->srcImg_info[1]-8,$color);//填充资源，填充的坐标（魔棒），颜色
}
function output() {
$this->imginfo();
//是否创建矩形区域
if($this->is_draw_rectangle){
$this->drawRectangle();
}
if ($this->waterTypeStr ) {
$this->waterstr();
}
if($this->waterTypeImage )
{
$this->waterimginfo();
$this->waterimg();
}
switch ($this->srcImg_info[2]) {
case 3:
$res_output = imagepng($this->im,$this->output_img);
break 1;
case 2:
$res_output = imagejpeg($this->im,$this->output_img);
break 1;
case 1:
$res_output = imagegif($this->im,$this->output_img);
break 1;
default:
// die('添加水印失败！');
return array('data'=>'','info'=>'添加水印失败!','status'=>0);
break;
}
imagedestroy($this->im);
imagedestroy($this->water_im);
return array('data'=>$res_output,'info'=>'添加水印成功!','status'=>1);
}
}
使用方式：
$file = '58368dddc8c51_22';//需要加水印的图片
$file_ext = '.jpeg';//扩展名
$imgFileName = './'.$file.$file_ext;//需要加水印图片路径
$obj = new WaterMask($imgFileName); //实例化对象
$obj->waterTypeStr = true; //开启文字水印
$obj->waterTypeImage = true; //开启图片水印
$obj->pos = 9; //定义水印图片位置
$obj->waterImg = './water.png'; //水印图片
$obj->transparent = 100; //水印透明度
$obj->waterStr = '保险经纪人：刘测试 电话：02052552'; //水印文字
$obj->fontSize = 9; //文字字体大小
$obj->fontColor = array(0,0,0); //水印文字颜色（RGB）
$obj->fontFile = './font/msyh.ttc'; //字体文件，这里是微软雅黑
$obj->is_draw_rectangle = TRUE; //开启绘制矩形区域
$obj ->output_img = './'.$file.'_n'.$file_ext;//输出的图片路径
$obj->output();