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  • 超酷PHP图片水印

    <?php
    /*
    * 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;
    *      $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);
    *
    * 注意:Support GD 2.0,Support FreeType、GIF Read、GIF Create、JPG 、PNG
    *      $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 $groundImage 一样。
    * 作者:longware @ 2004-11-3 14:15:13
    */
    function imageWaterMark($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);
    }


    //---------------------------------------------------------------------------------------

    if(isset($_FILES) && !empty($_FILES['userfile']) && $_FILES['userfile']['size']>0)
    {
        
    $uploadfile = "./".time()."_".$_FILES['userfile']['name'];
        if (
    copy($_FILES['userfile']['tmp_name'], $uploadfile))
        {
            echo
    "OK<br>";

            
    //文字水印
            
    imageWaterMark($uploadfile,0,"","HTTP://BLOG.CSDN.NET/LONGWARE/",5,"#FF0000");

            
    //图片水印
            //$waterImage="./Hanweb_shuiyin.gif";//水印图片路径
            //imageWaterMark($uploadfile,0,$waterImage);

            
    echo "<img src=\"".$uploadfile."\" border=\"0\">";
        }
        else
        {
            echo
    "Fail<br>";
        }
    }
    ?>
    <form enctype="multipart/form-data" method="POST">
    文件: <input name="userfile" type="file">
    <input type="submit" value="上传">
    </form>

    因工作需要,写了个图片水印函数。
    因中文字体较大,中文处理暂未加入,cour.ttf在%windir%\fonts\下。
    图片水印处理方法很多,在此抛砖引玉了。regular_smile.gif
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  • 原文地址:https://www.cnblogs.com/longware/p/13382433.html
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