-
-
/**
- * 图片加水印(适用于png/jpg/gif格式)
- * * @author flynetcn
- * * @param $srcImg 原图片
- * @param $waterImg 水印图片
- * @param $savepath 保存路径
- * @param $savename 保存名字
- * @param $positon 水印位置
- * 1:顶部居左, 2:顶部居右, 3:居中, 4:底部局左, 5:底部居右
- * @param $alpha 透明度 -- 0:完全透明, 100:完全不透明 *
- * @return 成功 -- 加水印后的新图片地址
- * 失败 -- -1:原文件不存在, -2:水印图片不存在, -3:原文件图像对象建立失败-4:水印文件图像对象建立失败, -5:加水印后的新图片保存失败
- */
- function img_water_mark($srcImg, $waterImg, $savepath=null, $savename=null, $positon=5, $alpha=30) {
- $temp = pathinfo($srcImg);
- $name = $temp['basename'];
- $path = $temp['dirname'];
- $exte = $temp['extension'];
- $savename = $savename ? $savename : $name;
- $savepath = $savepath ? $savepath : $path;
- $savefile = $savepath .'/'. $savename;
- $srcinfo = @getimagesize($srcImg);
- if (!$srcinfo) {
- return -1; //原文件不存在
- }
- $waterinfo = @getimagesize($waterImg);
- if (!$waterinfo) {
- return -2; //水印图片不存在
- }
- $srcImgObj = image_create_from_ext($srcImg);
- if (!$srcImgObj) {
- return -3; //原文件图像对象建立失败
- }
- $waterImgObj = image_create_from_ext($waterImg);
- if (!$waterImgObj) {
- return -4; //水印文件图像对象建立失败
- } switch ($positon) {
- //1顶部居左
- case 1: $x=$y=0; break;
- //2顶部居右
- case 2: $x = $srcinfo[0]-$waterinfo[0]; $y = 0; break;
- //3居中
- case 3: $x = ($srcinfo[0]-$waterinfo[0])/2; $y = ($srcinfo[1]-$waterinfo[1])/2; break; //4底部居左 case 4: $x = 0; $y = $srcinfo[1]-$waterinfo[1]; break; //5底部居右 case 5: $x = $srcinfo[0]-$waterinfo[0]; $y = $srcinfo[1]-$waterinfo[1]; break; default: $x=$y=0; } imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo[0], $waterinfo[1], $alpha);
- switch ($srcinfo[2]) {
- case 1: imagegif($srcImgObj, $savefile); break;
- case 2: imagejpeg($srcImgObj, $savefile); break;
- case 3: imagepng($srcImgObj, $savefile); break;
- default: return -5; //保存失败
- }
- imagedestroy($srcImgObj);
- imagedestroy($waterImgObj);
- return $savefile; } function image_create_from_ext($imgfile) {
- $info = getimagesize($imgfile);
- $im = null; switch ($info[2]) {
- case 1: $im=imagecreatefromgif($imgfile); break;
- case 2: $im=imagecreatefromjpeg($imgfile); break;
- case 3: $im=imagecreatefrompng($imgfile); break;
- }
- return $im;
- } ?>
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