绝对好用的php图片加水印

//在网上找的水印代码：/* * 功能：PHP图片水印 (水印支持图片或文字) * 参数： *      $product_img    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 $product_img 一样。 * 作者：longware @ 2004-11-3 14:15:13 */ //$product_img="data/upload/566fbbad2e83f.png";//$waterImage="data/upload/waterimg/san7.png";//imageWaterMark($product_img,0,$waterImage,'',9,'');function imageWaterMark($product_img,$waterPos=0,$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。";     //echo $waterImage;    //print_r(file_exists("data/upload/waterimg/san.png"));die();    //读取水印文件     if(!empty($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($formatMsg);         }     }     //读取背景图片     if(!empty($product_img) && file_exists($product_img))     {         $ground_info = getimagesize($product_img);         $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:$ground_im = imagecreatefromgif($product_img);break;             case 2:$ground_im = imagecreatefromjpeg($product_img);break;             case 3:$ground_im = imagecreatefrompng($product_img);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,"arial.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;     }     $waterPos=9;    switch($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, $B));             }     //生成水印后的图片     @unlink($product_img);     switch($ground_info[2])//取得背景图片的格式     {         case 1:imagegif($ground_im,$product_img);break;         case 2:imagejpeg($ground_im,$product_img);break;         case 3:imagepng($ground_im,$product_img);break;         default:die($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://www.php100.com",5,"#FF0000");         //图片水印         //$waterImage="images/bz.gif";//水印图片路径         //imageWaterMark($uploadfile,0,$waterImage);         echo "<img src='".$uploadfile."' border='0'>";     }     else     {         echo "Fail<br>";     } }