两个PHP给图片加水印的代码分享

2006
06.05

两个PHP给图片加水印的代码分享

Category: PHP / Zend, 技术交流 / Tags: no tag / Add Comment

收集的两个PHP增加图片水印的类，Michael还没进行过充分测试，有什么问题请反馈给我。
另外故人居也使用了一个Michael自己开发的增加图片水印函数，有机会一起整理出来给大家。

一、PHP给图片增加水印的类

<?php
Class Gimage{
   var $src_image_name = ""; //输入图片的文件名(必须包含路径名)
   var $jpeg_quality = 90; //jpeg图片质量
   var $save_image_file = ''; //输出文件名
   var $wm_image_name = ""; //水印图片的文件名(必须包含路径名)
   var $wm_image_pos = 1; //水印图片放置的位置
   // 0 = middle
   // 1 = top left
   // 2 = top right
   // 3 = bottom right
   // 4 = bottom left
   // 5 = top middle
   // 6 = middle right
   // 7 = bottom middle
   // 8 = middle left
   //other = 3
   var $wm_image_transition = 20; //水印图片与原图片的融合度 (1=100)

   var $wm_text = ""; //水印文字(支持中英文以及带有\r\n的跨行文字)
   var $wm_text_size = 20; //水印文字大小
   var $wm_text_angle = 4; //水印文字角度,这个值尽量不要更改
   var $wm_text_pos = 3; //水印文字放置位置
   var $wm_text_font = ""; //水印文字的字体
   var $wm_text_color = "#cccccc"; //水印字体的颜色值

   function create($filename="")
   {
   if ($filename) $this->src_image_name = strtolower(trim($filename));

   $src_image_type = $this->get_type($this->src_image_name);
   $src_image = $this->createImage($src_image_type,$this->src_image_name);
   if (!$src_image) return;
   $src_image_w=ImageSX($src_image);
   $src_image_h=ImageSY($src_image);


   if ($this->wm_image_name){
   $this->wm_image_name = strtolower(trim($this->wm_image_name));
   $wm_image_type = $this->get_type($this->wm_image_name);
   $wm_image = $this->createImage($wm_image_type,$this->wm_image_name);
   $wm_image_w=ImageSX($wm_image);
   $wm_image_h=ImageSY($wm_image);
   $temp_wm_image = $this->getPos($src_image_w,$src_image_h,$this->wm_image_pos,$wm_image);
   $wm_image_x = $temp_wm_image["dest_x"];
   $wm_image_y = $temp_wm_image["dest_y"];
   imageCopyMerge($src_image, $wm_image,$wm_image_x,$wm_image_y,0,0,$wm_image_w,$wm_image_h,$this->wm_image_transition);
   }

   if ($this->wm_text){
   $this->wm_text = $this->gb2utf8($this->wm_text);
   $temp_wm_text = $this->getPos($src_image_w,$src_image_h,$this->wm_text_pos);
   $wm_text_x = $temp_wm_text["dest_x"];
   $wm_text_y = $temp_wm_text["dest_y"];
   if(preg_match("/([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])([a-f0-9][a-f0-9])/i", $this->wm_text_color, $color))
   {
   $red = hexdec($color[1]);
   $green = hexdec($color[2]);
   $blue = hexdec($color[3]);
   $wm_text_color = imagecolorallocate($src_image, $red,$green,$blue);
   }else{
   $wm_text_color = imagecolorallocate($src_image, 255,255,255);
   }

   imagettftext($src_image, $this->wm_text_size, $this->wm_angle, $wm_text_x, $wm_text_y, $wm_text_color,$this->wm_text_font, $this->wm_text);
   }

   if ($this->save_file) {
   switch ($this->output_type){
   case 'gif':$src_img=ImagePNG($src_image, $this->save_file); break;
   case 'jpeg':$src_img=ImageJPEG($src_image, $this->save_file, $this->jpeg_quality); break;
   case 'png':$src_img=ImagePNG($src_image, $this->save_file); break;
   default:$src_img=ImageJPEG($src_image, $this->save_file, $this->jpeg_quality); break;
   }
   } else {
   if ($src_image_type = "jpg") $src_image_type="jpeg";
   header("Content-type: image/{$src_image_type}");
   switch ($src_image_type){
   case 'gif':$src_img=ImagePNG($src_image); break;
   case 'jpg':$src_img=ImageJPEG($src_image, "", $this->jpeg_quality);break;
   case 'png':$src_img=ImagePNG($src_image);break;
   default:$src_img=ImageJPEG($src_image, "", $this->jpeg_quality);break;
   }
   }
   imagedestroy($src_image);
   }


   /**
   * 根据文件名和类型创建图片
   *
   * @access private
   * @param string $type 图片的类型，包括gif,jpg,png
   * @param string $img_name 图片文件名，包括路径名，如"./mouse.jpg"
   * @return mixed $tmp_img 返回一图像标识符
   */
   function createImage($type,$img_name){
   if (!$type){
   $type = $this->get_type($img_name);
   }

   switch ($type){
   case 'gif':
   if (function_exists('imagecreatefromgif'))
   $tmp_img=@ImageCreateFromGIF($img_name);
   break;
   case 'jpg':
   $tmp_img=ImageCreateFromJPEG($img_name);
   break;
   case 'png':
   $tmp_img=ImageCreateFromPNG($img_name);
   break;
   default:
   $tmp_img=ImageCreateFromString($img_name);
   break;
   }
   return $tmp_img;
   }


   /**
   * 根据源图像的长、宽，位置代码，水印图片id来生成把水印放置到源图像中的位置
   *
   * @access pravate
   * @param int $sourcefile_width 源图像的宽
   * @param int $sourcefile_height 原图像的高
   * @param int $pos 位置代码
   * 0 = middle
   * 1 = top left
   * 2 = top right
   * 3 = bottom right
   * 4 = bottom left
   * 5 = top middle
   * 6 = middle right
   * 7 = bottom middle
   * 8 = middle left
   * @param int $wm_image 水印图片ID
   * @return array 返回位置参数数组
   */
   function getPos($sourcefile_width,$sourcefile_height,$pos,$wm_image=""){
   if ($wm_image){
   $insertfile_width = ImageSx($wm_image);
   $insertfile_height = ImageSy($wm_image);
   }else {
   $lineCount = explode("\r\n",$this->wm_text);
   $fontSize = imagettfbbox($this->wm_text_size,$this->wm_text_angle,$this->wm_text_font,$this->wm_text);
   $insertfile_width = $fontSize[2] - $fontSize[0];
   $insertfile_height = count($lineCount)*($fontSize[1] - $fontSize[3]);
   }

   switch ($pos){
   case 0:
   $dest_x = ( $sourcefile_width / 2 ) - ( $insertfile_width / 2 );
   $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
   break;

   case 1:
   $dest_x = 0;
   if ($this->wm_text){
   $dest_y = $insertfile_height;
   }else{
   $dest_y = 0;
   }
   break;

   case 2:
   $dest_x = $sourcefile_width - $insertfile_width;
   if ($this->wm_text){
   $dest_y = $insertfile_height;
   }else{
   $dest_y = 0;
   }
   break;

   case 3:
   $dest_x = $sourcefile_width - $insertfile_width;
   $dest_y = $sourcefile_height - $insertfile_height;
   break;

   case 4:
   $dest_x = 0;
   $dest_y = $sourcefile_height - $insertfile_height;
   break;

   case 5:
   $dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );
   if ($this->wm_text){
   $dest_y = $insertfile_height;
   }else{
   $dest_y = 0;
   }
   break;

   case 6:
   $dest_x = $sourcefile_width - $insertfile_width;
   $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
   break;

   case 7:
   $dest_x = ( ( $sourcefile_width - $insertfile_width ) / 2 );
   $dest_y = $sourcefile_height - $insertfile_height;
   break;

   case 8:
   $dest_x = 0;
   $dest_y = ( $sourcefile_height / 2 ) - ( $insertfile_height / 2 );
   break;

   default:
   $dest_x = $sourcefile_width - $insertfile_width;
   $dest_y = $sourcefile_height - $insertfile_height;
   break;
   }
   return array("dest_x"=>$dest_x,"dest_y"=>$dest_y);
   }

   /**
   * 指定的文字转换为UTF-8格式，包括中英文混合
   *
   * @access private
   * @param string $gb 输入gb类型的字数串
   * @return string $utf8
   */
   function gb2utf8($gb)
   {
   if(!trim($gb))
   return $gb;
   $filename="./gb2312.txt";
   $tmp=file($filename);
   $codetable=array();
   while(list($key,$value)=each($tmp))
   $codetable[hexdec(substr($value,0,6))]=substr($value,7,6);

   $utf8="";
   while($gb)
   {
   if (ord(substr($gb,0,1))>127) {
   $tthis=substr($gb,0,2);
   $gb=substr($gb,2,strlen($gb)-2);
   $utf8.=$this->u2utf8(hexdec($codetable[hexdec(bin2hex($tthis))-0x8080]));
   } else {
   $tthis=substr($gb,0,1);
   $gb=substr($gb,1,strlen($gb)-1);
   $utf8.=$this->u2utf8($tthis);
   }
   }
   return $utf8;
   }

   function u2utf8($c)
   {
   $str="";
   if ($c < 0x80) {
   $str.=$c;
   } else if ($c < 0x800) {
   $str.=chr(0xC0 | $c>>6);
   $str.=chr(0x80 | $c & 0x3F);
   } else if ($c < 0x10000) {
   $str.=chr(0xE0 | $c>>12);
   $str.=chr(0x80 | $c>>6 & 0x3F);
   $str.=chr(0x80 | $c & 0x3F);
   } else if ($c < 0x200000) {
   $str.=chr(0xF0 | $c>>18);
   $str.=chr(0x80 | $c>>12 & 0x3F);
   $str.=chr(0x80 | $c>>6 & 0x3F);
   $str.=chr(0x80 | $c & 0x3F);
   }
   return $str;
   }

   /**
   * 获得图片的格式，包括jpg,png,gif
   *
   * @access private
   * @param string $img_name 图片文件名，可以包括路径名
   * @return string $type
   */
   function get_type($img_name)
   {
   $name_array = explode(".",$img_name);
   if (preg_match("/\.(jpg|jpeg|gif|png)$/", $img_name, $matches))
   $type = strtolower($matches[1]);
   else
   $type = "string";

   return $type;
   }

}
?>

该类使用方法如下：

$img = new Gimage();
$img->wm_text = "www.discuz.com";
$img->wm_text_font = "./STXINWEI.TTF";
$img->create("./mouse.jpg");

mouse.jpg 是你要在其上添加水印的图片名称，注意包含路径名
STXINWEI.TTF 是字体文件的路径名＋文件名
这就是一个简单的测试。如果要调整更复杂的显示效果，只要修改一下类中的属性就可以了，例如把字体放大就可以
$img->wm_text_size = 20;
增加水印图片就可以
$img->wm_image_name=”文件名”;

二、给图片增加水印的php文件，包含实际运行代码，支持图片和文字水印

<?php
/*
* 功能：PHP图片水印 (水印支持图片或文字)
* 参数：
* $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)；
*
* 注意：Support GD 2.0，Support FreeType、GIF Read、GIF Create、JPG 、PNG
* $waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage。
* 当$waterImage有效时，参数$waterString、$stringFont、$stringColor均不生效。
* 加水印后的图片的文件名和 $groundImage 一样。
* 作者：longware @ 2004-11-3 14:15:13
*/
function imageWaterMark($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*2.5),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;
   $posY = $ground_h - $h;
   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( !empty($textColor) && (strlen($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);
}

if(isset($_FILES) && !empty($_FILES['userfile']) && $_FILES['userfile']['size']>0) {
   $uploadfile = "./".time()."_".$_FILES['userfile']['name'];
   if (copy($_FILES['userfile']['tmp_name'], $uploadfile)) {
   echo "OK<br>";

   //文字水印
   imageWaterMark($uploadfile,0,"","HTTP://BLOG.CSDN.NET/LONGWARE/",5,"#FF0000");

   //图片水印
   //$waterImage="./Hanweb_shuiyin.gif";//水印图片路径
   //imageWaterMark($uploadfile,0,$waterImage);

   echo "<img src=\"".$uploadfile."\" border=\"0\">";
   } else {
   echo "Fail<br>";
   }
}
?>

<form enctype="multipart/form-data" method="POST">
文件: <input name="userfile" type="file">
<input type="submit" value="上传">
</form>

有什么问题欢迎大家一起探讨，如果有更好的实现思路欢迎分享。

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