更新 2020-07-16 浏览 983次
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) | - |