这篇文章主要介绍“PHP给图片加上图片水印和文字水印的方法”，在日常操作中，相信很多人在PHP给图片加上图片水印和文字水印的方法问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”PHP给图片加上图片水印和文字水印的方法”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
核心代码：
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：
waterText('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。
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