PHP上传图片自动加水印

<?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 $groundImage 一样.    *autor: PHP教程网    /    imageWaterMark($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*5.5),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,5,"","HTTP://www.iiwnet.Com",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