PHP经典的给图片加水印程序

<?php
/**

参数说明:
$max_file_size : 上传文件大小限制, 单位BYTE
$destination_folder : 上传文件路径
$watermark : 是否附加水印(1为加水印,其他为不加水印);

使用说明:

1. 将PHP.INI文件里面的"extension=php_gd2.dll"一行前面的;号去掉,因为我们要用到GD库;
2. 将extension_dir =改为你的php_gd2.dll所在目录;
   **/

//上传文件类型列表
$uptypes=array(
'image/jpg',
'image/jpeg',
'image/png',
'image/pjpeg',
'image/gif',
'image/bmp',
'image/x-png'
);

$max_file_size=2000000; //上传文件大小限制, 单位BYTE
$destination_folder="uploadimg/"; //上传文件路径
$watermark=1; //是否附加水印(1为加水印,其他为不加水印);
$watertype=1; //水印类型(1为文字,2为图片)
$waterposition=1; //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
$waterstring="http://www.mop8.com/"; //水印字符串
$waterimg="xplore.gif"; //水印图片
$imgpreview=1; //是否生成预览图(1为生成,其他为不生成);
$imgpreviewsize=1/1; //缩略图比例
?>

if(!in_array($file["type"], $uptypes))
//检查文件类型
{
echo "文件类型不符!".$file["type"];
exit;
}

if(!file_exists($destination_folder))
{
mkdir($destination_folder);
}

$filename=$file["tmp_name"];
$image_size = getimagesize($filename);
$pinfo=pathinfo($file["name"]);
$ftype=$pinfo['extension'];
$destination = $destination_folder.time().".".$ftype;
if (file_exists($destination) && $overwrite != true)
{
echo "同名文件已经存在了";
exit;
}

if(!move_uploaded_file ($filename, $destination))
{
echo "移动文件出错";
exit;
}

$pinfo=pathinfo($destination);
$fname=$pinfo[basename];
echo " 已经成功上传
文件名: ".$destination_folder.$fname."
";
echo " 宽度:".$image_size[0];
echo " 长度:".$image_size[1];
echo "
大小:".$file["size"]." bytes";

if($watermark==1)
{
$iinfo=getimagesize($destination,$iinfo);
$nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
$white=imagecolorallocate($nimage,255,255,255);
$black=imagecolorallocate($nimage,0,0,0);
$red=imagecolorallocate($nimage,255,0,0);
imagefill($nimage,0,0,$white);
switch ($iinfo[2])
{
case 1:
$simage =imagecreatefromgif($destination);
break;
case 2:
$simage =imagecreatefromjpeg($destination);
break;
case 3:
$simage =imagecreatefrompng($destination);
break;
case 6:
$simage =imagecreatefromwbmp($destination);
break;
default:
die("不支持的文件类型");
exit;
}

   imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);     
   imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);     

   switch($watertype)     
   {     
       case 1:   //加水印字符串     
       imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);     
       break;     
       case 2:   //加水印图片     
       $simage1 =imagecreatefromgif("xplore.gif");     
       imagecopy($nimage,$simage1,0,0,0,0,85,15);     
       imagedestroy($simage1);     
       break;     
   }     

   switch ($iinfo[2])     
   {     
       case 1:     
       //imagegif($nimage, $destination);     
       imagejpeg($nimage, $destination);     
       break;     
       case 2:     
       imagejpeg($nimage, $destination);     
       break;     
       case 3:     
       imagepng($nimage, $destination);     
       break;     
       case 6:     
       imagewbmp($nimage, $destination);     
       //imagejpeg($nimage, $destination);     
       break;     
   }     

   //覆盖原上传文件     
   imagedestroy($nimage);     
   imagedestroy($simage);     

}

if($imgpreview==1)
{
echo "
图片预览:
";
echo "<img src="".$destination."" width=".($image_size[0]$imgpreviewsize)." height=".($image_size[1]$imgpreviewsize);
echo " alt="图片预览:r文件名:".$destination."r上传时间:">";
}
}
?>