PHP水印类,支持添加图片、文字、填充颜色区域的实现

<?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);
  }
}

$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();