php为图片添加水印
<?php/*** 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 = $srcinfo-$waterinfo; $y = 0; break;//3居中case 3: $x = ($srcinfo-$waterinfo)/2; $y = ($srcinfo-$waterinfo)/2; break;//4底部居左case 4: $x = 0; $y = $srcinfo-$waterinfo; break;//5底部居右case 5: $x = $srcinfo-$waterinfo; $y = $srcinfo-$waterinfo; break;default: $x=$y=0;}imagecopymerge($srcImgObj, $waterImgObj, $x, $y, 0, 0, $waterinfo, $waterinfo, $alpha);switch ($srcinfo) {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) {case 1: $im=imagecreatefromgif($imgfile); break;case 2: $im=imagecreatefromjpeg($imgfile); break;case 3: $im=imagecreatefrompng($imgfile); break;}return $im;}
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