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支持文字水印、图片水印  支持水印的位置随机或固定（九宫格）  水印透明度设置（图片水印和文字水印都支持）  文字水印的字体、颜色、大小设置  图片水印的背景透明  。

复制代码代码如下

<?php  /**  * 加水印类，支持文字图片水印的透明度设置、水印图片背景透明。  * 日期：2011-09-27  * 作者：www.zzvips.com  * 使用：  * $obj = new WaterMask($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.zzvips.com'; //水印文字  * $obj->$fontSize = 16; //文字字体大小  * $obj->$fontColor = array(255,0255); //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 = 1; //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.zzvips.com'; //水印文字  public $fontSize = 16; //文字字体大小  public $fontColor = array(255,0,255); //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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