PHP添加图片和文字水印实例

PHP核心函数

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 * 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 - 10; // -10 是距离右侧10px 可以自己调节 $posY = $ground_h - $h - 10; // -10 是距离底部10px 可以自己调节 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, $water_h); //拷贝水印到目标文件 } else {//文字水印 if (!emptyempty($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); }

文字水印

imageWaterMark('banner.jpg', 9, '','sucaihuo.com'); //背景图片,$waterPos水印位置,水印图片地址

图片水印

imageWaterMark('404.jpg', 9, 'logo.gif'); //背景图片,$waterPos水印位置,水印图片地址

注意：$waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage

参数	描述	默认值
$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)	-