有没有PHP图片水印的简单例子

http://topic.csdn.net/u/20071202/20/7eafcdc7-186a-4869-a54b-e32ddd011b29.html
<?php//审明图片文件夹
$bigfolder="img";
$smallfolder="smallimg";
//审明文件夹名称以年月日来建议文件夹
$fdate=date("Ymd");
//echo $fdate;
//审明文件名称。以年月日时分秒命名
$fname=date("YmdHis");
$bigname="0724e_com_".$fname;
$smallname="0724e_com_".$fname."_s";
//echo $fname."<br/>".$bigname."<br/>".$smallname;
//确定大小文件夹的名称和路经
$bigaddrname=$bigfolder."/".$fdate."/".$bigname;
$smalladdrname=$smallfolder."/".$fdate."/".$smallname;
//审明小图片的高度和宽度
$RESIZEWIDTH=180;
$RESIZEHEIGHT=150;
//审明水印的文字或图片的地址及字体的地址
$imgaddr="img.jpg";    //图片水印
$fontname="www.0724e.com";  //文字水印
//充许上传的文件扩展名
$exit_name=array(".jpg",".gif",".png");
if (isset($_POST['Submit'])){
//上传部分----------------------------
//定议上传名称和上传错误
$upfile=$_FILES['image']['name'];
$uperror=$_FILES['image']['error'];
//最简表单验证switch ($uperror) {
  case 1:
      die("<div align=\"center\">上传真过PHP设置充许的最大值<a href=\"javascript:history.back();\">点击返回</a></div>");
  break;
  case 2:
   die("<div align=\"center\">上传超过了表单充许的最大值<a href=\"javascript:history.back();\">点击返回</a></div>");
  break;
  case 3:
   die("<div align=\"center\">文件只有部分被上传了<a href=\"javascript:history.back();\">点击返回</a></div>");
     break;
  case 4:
   die("<div align=\"center\">文件不有被上传<a href=\"javascript:history.back();\">点击返回</a></div>");
     break;
}//检测扩展是否是充许上传的文件类型
//取得文件扩展名
$exname=strrchr($upfile,".");
//判断取得扩展名是否在要求的扩展名内
if(!in_array($exname,$exit_name))
die("<div align=\"center\">文件扩展名不对。只允许上传jpg gif png的图片<a href=\"java script:history.back();\">点击返回</a></div>");//检测存放图片的目录和子目录是否存在，如果不存在则建目录和子目录，并给目录最大权限777 对LINUX或unix对WINDOWS没必要
//大图
if (!file_exists($bigfolder)){
  mkdir($bigfolder,0777);
  mkdir($bigfolder."/".$fdate,0777);
}else{
  if (!file_exists($bigfolder."/".$fdate)){
   mkdir($bigfolder."/".$fdate,0777);
  }
}
//缩略图
if (!file_exists($smallfolder)){
  mkdir($smallfolder,0777);
  mkdir($smallfolder."/".$fdate,0777);
}else{
  if (!file_exists($smallfolder."/".$fdate)){
  mkdir($smallfolder."/".$fdate,0777);
  }
}
//创建目录结束//得到临时上传的文件
$upfiletmp=$_FILES['image']['tmp_name'];
//判断临时文件是否存在
if ($uperror==6)
die("<div align=\"center\">找不到临时上传文件，上传失败<a href=\"javascript:history.back();\">点击返回</a></div>");
//水印部分==========================================
//水印函数开始============
/**      $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；
*      $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；
*      $textColor      文字颜色，值为十六进制颜色值，默认为#FF0000(红色)；
* */function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="", $textFont=5,$textColor="#FF0000")
{
    $isWaterImage = FALSE;
    $formatMsg = "暂不支持该文件格式，请用图片处理软件将图片转换为GIF、JPG、PNG格式。";    //读取水印文件
    if(!empty($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($formatMsg);
        }
    } else {
        die("需要加水印的图片不存在！");
    }    //水印位置
    if($isWaterImage) { //图片水印
        $w = $water_w;
        $h = $water_h;
        $label = "图片的";
    } else {  //文字水印
        $temp = imagettfbbox(ceil($textFont*2.5),0,"./cour.ttf",$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;
            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
    } 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,$groundImage);break;
        case 3:imagepng($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);
}
//水印函数完
//存在则移动完在上传
$goodupfile=@move_uploaded_file($upfiletmp,$bigaddrname.$exname);
if (!$goodupfile){
die("<div align=\"center\">上传图片失败<a href=\"javascript:history.back();\">点击返回</a></div>");
}else{

//文字水印
    imageWaterMark($bigaddrname.$exname,5,"",$fontname,5,"#FF0000");    //图片水印
    //imageWaterMark($bigaddrname.$exname,5,$imgaddr);
//结束水印部分===================================
   //缩略图部分------------------------------------------------------------
//判断缩略图大小函数-----
    function ResizeImage($im,$maxwidth,$maxheight,$name){
    $width = imagesx($im);
    $height = imagesy($im);
    if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
        if($maxwidth && $width > $maxwidth){
            $widthratio = $maxwidth/$width;
            $RESIZEWIDTH=true;
        }
        if($maxheight && $height > $maxheight){
            $heightratio = $maxheight/$height;
            $RESIZEHEIGHT=true;
        }
        if($RESIZEWIDTH && $RESIZEHEIGHT){
            if($widthratio < $heightratio){
                $ratio = $widthratio;
            }else{
                $ratio = $heightratio;
            }
        }elseif($RESIZEWIDTH){
            $ratio = $widthratio;
        }elseif($RESIZEHEIGHT){
            $ratio = $heightratio;
        }
        $newwidth = $width * $ratio;
        $newheight = $height * $ratio;
        if(function_exists("imagecopyresampled")){
              $newim = imagecreatetruecolor($newwidth, $newheight);
              imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
        }else{
            $newim = imagecreate($newwidth, $newheight);
              imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
        }
        ImageJpeg ($newim,$smalladdrname.$name.".jpg");
        ImageDestroy ($newim);
    }else{
        ImageJpeg ($im,$smalladdrname.$name.".jpg");
    }
    }
    //生成部分
    if($_FILES['image']['size']){
    if($_FILES['image']['type'] == "image/pjpeg"){
        $im = imagecreatefromjpeg($bigaddrname.$exname);
    }elseif($_FILES['image']['type'] == "image/x-png"){
        $im = imagecreatefrompng($bigaddrname.$exname);
    }elseif($_FILES['image']['type'] == "image/gif"){
        $im = imagecreatefromgif($bigaddrname.$exname);
    }
    if($im){
        if(file_exists($smalladdrname.".jpg")){
            unlink($smalladdrname.".jpg");
        }
        ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$smalladdrname);
        ImageDestroy ($im);
    }
    }
    echo "<div align='center'><a href='javascript:window.history.back()'>上传成功</a></div>";
}
//缩略图结束-----------------------------------------------------

}
?>
<form action="" method="post" enctype="multipart/form-data" name="form1" id="form1">
  <input type="file" name="image" />
  <input type="hidden" name="MAX_FILE_SIZE" value="<?=1024*100?>">
  <input type="submit" name="Submit" value="上传图片" />
</form>

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有没有PHP图片水印的简单例子

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