PHP添加文字水印或图片水印的水印类完整源代码与使用示例

PHP实现的给图片添加水印功能，可添加文字水印或图片水印，使用文字水印时需要提供字体

PHP实现的给图片添加水印功能，可添加文字水印或图片水印，使用文字水印时需要提供字体文件，使用图片水印时需要提供水印图片，水印图片不能比要添加水印的图片大，请使用背景透明的水印图片。

该水印类支持自定义水印位置、自定义水印大小和水印的透明度，字体水印可自定义颜色等，功能已相应完善。

完整源代码如下(注解中已给出使用示例)：

<?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 = 'www.jb51.net'; //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
 */
class WaterMask{
 public $waterType = 0; //水印类型：0为文字水印、1为图片水印
 public $pos = 0; //水印位置
 public $transparent = 45; //水印透明度
 public $waterStr = 'www.jb51.net'; //水印文字
 public $fontSize = 18; //文字字体大小
 public $fontColor = array(255,255,255); //水印文字颜色（RGB）
 public $fontFile = 'AHGBold.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 $y = ''; //水印y坐标
 function __construct($img) { //析构函数
 $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
 }
 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。');
 }
 }
 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（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
 }
 }
 private function waterpos() { //水印位置算法
 switch ($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;
 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;
 }
 }
 private function waterimg() {
 if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){
 die('水印比原图大！');
 }
 $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();
 }
 function output() {
 $this->imginfo();
 if ($this->waterType == 0) {
 $this->waterstr();
 }else {
 $this->waterimginfo();
 $this->waterimg();
 }
 switch ($this->srcImg_info[2]) {
 case 3:
 imagepng($this->im,$this->srcImg);
 break 1;
 case 2:
 imagejpeg($this->im,$this->srcImg);
 break 1;
 case 1:
 imagegif($this->im,$this->srcImg);
 break 1;
 default:
 die('添加水印失败！');
 break;
 }
 imagedestroy($this->im);
 imagedestroy($this->water_im);
 }
}
?>

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php水印类完整源码与使用示例 php添加文字水印或图片水印的水印类完整源代码与使用示例