PHP应用：Kindeditor编辑器添加图片上传水印功能（php代码）

PHP应用
/*
  * 功能：PHP图片水印,水印支持图片或文字
  * 参数：
  * $groundImage 背景图片,即需要加水印的图片,暂只支持GIF,JPG,PNG格式；
  * $waterPos 水印位置,有10种状态,0为随机位置；
  *  1为顶端居左,2为顶端居中,3为顶端居右；
  *  4为中部居左,5为中部居中,6为中部居右；
  *  7为底端居左,8为底端居中,9为底端居右；
  * $waterImage 图片水印,即作为水印的图片,暂只支持GIF,JPG,PNG格式；
  * $alpha 水印透明度,取值1-100；
  * $waterText 文字水印,即把文字作为为水印,支持ASCII码,不支持中文；
  * $textFont 文字大小,值为1、2、3、4或5,默认为5；
  * $textColor 文字颜色,值为十六进制颜色值,默认为#FF0000(红色)；
  *
  * $waterImage 和 $waterText 最好不要同时使用,选其中之一即可,优先使用 $waterImage.
  * 当$waterImage有效时,参数$waterString、$stringFont、$stringColor均不生效.
  * 加水印后的图片的文件名和 $groundImage 一样.
*/
function imageWaterMark($groundImage, $waterPos=0, $waterImage='', $alpha=80, $waterText='', $water_fontfile, $textFont=9, $textColor='#FF0000'){
  $isWaterImage = FALSE;
  $formatMsg = '不支持该图片格式!请使用GIF、JPG、PNG格式的图片.';
  $fontFile = $water_fontfile;
  //读取水印文件
  if(!empty($waterImage) && file_exists($waterImage)){
    $isWaterImage = TRUE;
    $water_info = getimagesize($waterImage);
    $water_w = $water_info[0];//取得水印图片的宽
    $water_h = $water_info[1];//取得水印图片的高
    switch($water_info[2]){//取得水印图片的格式
      case 1:$water_im = imagecreatefromgif($waterImage);break;
      case 2:$water_im = imagecreatefromjpeg($waterImage);break;
      case 3:$water_im = imagecreatefrompng($waterImage);break;
      default:die($formatMsg);
    }
  }
  //读取背景图片
  if(!empty($groundImage) && file_exists($groundImage)){
    $ground_info = getimagesize($groundImage);
    $ground_w = $ground_info[0];//取得背景图片的宽
    $ground_h = $ground_info[1];//取得背景图片的高
    switch($ground_info[2]){//取得背景图片的格式
      case 1:$ground_im = imagecreatefromgif($groundImage);break;
      case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
      case 3:$ground_im = imagecreatefrompng($groundImage);break;
      default:die($formatMsg);
    }
  }else{
    alert("水印图片不存在!");
  }
  //水印位置
  if($isWaterImage){//图片水印
    $w = $water_w;
    $h = $water_h;
    $label = "图片的";
  }else{//文字水印
    $temp = imagettfbbox($textFont, 0, $fontFile, $waterText);//取得使用 TrueType 字体的文本的范围
    $w = $temp[2] - $temp[6];
    $h = $temp[3] - $temp[7];
    unset($temp);
    $label = "文字区域";
  }
  if(($ground_w<$w) || ($ground_h<$h)){
    echo "需要加水印的图片的长度或宽度比水印".$label."还小,无法生成水印!";
    return;
  }
  switch($waterPos){
    case 0://随机
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
    case 1://1为顶端居左
    $posX = 0;
    $posY = 0;
    break;
    case 2://2为顶端居中
    $posX = ($ground_w - $w) / 2;
    $posY = 0;
    break;
    case 3://3为顶端居右
    $posX = $ground_w - $w;
    $posY = 0;
    break;
    case 4://4为中部居左
    $posX = 0;
    $posY = ($ground_h - $h) / 2;
    break;
    case 5://5为中部居中
    $posX = ($ground_w - $w) / 2;
    $posY = ($ground_h - $h) / 2;
    break;
    case 6://6为中部居右
    $posX = $ground_w - $w;
    $posY = ($ground_h - $h) / 2;
    break;
    case 7://7为底端居左
    $posX = 0;
    $posY = $ground_h - $h;
    break;
    case 8://8为底端居中
    $posX = ($ground_w - $w) / 2;
    $posY = $ground_h - $h;
    break;
    case 9://9为底端居右
    $posX = $ground_w - $w;
    $posY = $ground_h - $h;
    if(!$isWaterImage){
    $posY = $ground_h - $h-20;
    }
    break;
    default://随机
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
  }
  //设定图像的混色模式
  imagealphablending($ground_im, true);
  if($isWaterImage){//图片水印
    //imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
    //生成混合图像
    imagecopymerge($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h, $alpha);
  } else {//文字水印
    if( !empty($textColor) && (strlen($textColor)==7)){
      $R = hexdec(substr($textColor,1,2));
      $G = hexdec(substr($textColor,3,2));
      $B = hexdec(substr($textColor,5));
    } else {
      die("水印文字颜色格式不正确!");
    }
    imagestring($ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
  }
  //生成水印后的图片
  @unlink($groundImage);
  switch($ground_info[2]){//取得背景图片的格式
    case 1:imagegif($ground_im,$groundImage);break;
    case 2:imagejpeg($ground_im,$groundImage,100);break;//注意这里的100,经测试,100是图片质量最佳的,但文件大小会增加很多,95的时候质量还不错,大小和原来的差不多.作者采用95的值.
    case 3:imagepng($ground_im,$groundImage);break;
    default:die($errorMsg);
  }
  //释放内存
  if(isset($water_info)) unset($water_info);
  if(isset($water_im)) imagedestroy($water_im);
  unset($ground_info);
  imagedestroy($ground_im);
}

PHP应用
 /* 水印配置开始 */
  $water_mark = 1;//1为加水印, 其它为不加
  $water_pos = 9;//水印位置,10种状态【0为随机,1为顶端居左,2为顶端居中,3为顶端居右；4为中部居左,5为中部居中,6为中部居右；7为底端居左,8为底端居中,9为底端居】
  $water_img = $_SERVER['DOCUMENT_ROOT'].'/upfiles/water.gif';//水印图片,默认填写空,请将图片上传至网站根目录的upfiles下,例: water.gif
  $water_alpha = 50;//水印透明度
  $water_text = '';//水印字符串,默认填写空;
  //$water_fontfile = $_SERVER['DOCUMENT_ROOT'] .'/upfiles/fonts/arial.ttf';//文字水印使用的字体;
  if($water_mark == 1){
    imageWaterMark($file_path, $water_pos, $water_img, $water_alpha, $water_text, $water_fontfile);
  }
  /* 水印配置结束 */