PHP上傳圖片自動加水印

<?php
/*


功能:PHP圖片水印 (水印支持圖片或文字)
參數:
$groundImage 背景圖片,即需要加水印的圖片,暫只支持GIF,JPG,PNG格式;
$waterPos 水印位置,有10種狀態,0為隨機位置;
1為頂端居左,2為頂端居中,3為頂端居右;
4為中部居左,5為中部居中,6為中部居右;
7為底端居左,8為底端居中,9為底端居右;
$waterImage 圖片水印,即作為水印的圖片,暫只支持GIF,JPG,PNG格式;
$waterText 文字水印,即把文字作為為水印,支持ASCII碼,不支持中文;
$textFont 文字大小,值為1、2、3、4或5,默認為5;
$textColor 文字顏色,值為十六進制顏色值,默認為#FF0000(紅色);
*
注意:Support GD 2.0,Support FreeType、GIF Read、GIF Create、JPG 、PNG
$waterImage 和 $waterText 最好不要同時使用,選其中之一即可,優先使用 $waterImage.
當$waterImage有效時,參數$waterString、$stringFont、$stringColor均不生效.
加水印后的圖片的文件名和 $groundImage 一樣.

*autor: PHP教程網
/
imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000")
{
$isWaterImage = FALSE;
$formatMsg = "暫不支持該文件格式,請用圖片處理軟件將圖片轉換為GIF、JPG、PNG格式.";
//讀取水印文件
if(!empty($waterImage) && file_exists($waterImage))
{
$isWaterImage = TRUE;
$water_info = getimagesize($waterImage);
$water_w = $water_info[0];//取得水印圖片的寬
$water_h = $water_info[1];//取得水印圖片的高
switch($water_info[2])//取得水印圖片的格式
{
case 1:$water_im = imagecreatefromgif($waterImage);break;
case 2:$water_im = imagecreatefromjpeg($waterImage);break;
case 3:$water_im = imagecreatefrompng($waterImage);break;
default:die($formatMsg);
}
}
//讀取背景圖片
if(!empty($groundImage) && file_exists($groundImage))
{
$ground_info = getimagesize($groundImage);
$ground_w = $ground_info[0];//取得背景圖片的寬
$ground_h = $ground_info[1];//取得背景圖片的高
switch($ground_info[2])//取得背景圖片的格式
{
case 1:$ground_im = imagecreatefromgif($groundImage);break;
case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
case 3:$ground_im = imagecreatefrompng($groundImage);break;
default:die($formatMsg);
}
}
else
{
die("需要加水印的圖片不存在!");
}
//水印位置
if($isWaterImage)//圖片水印
{
$w = $water_w;
$h = $water_h;
$label = "圖片的";
}
else//文字水印
{
$temp = imagettfbbox(ceil($textFont*5.5),0,"./cour.ttf",$waterText);//取得使用 TrueType 字體的文本的范圍
$w = $temp[2] - $temp[6];
$h = $temp[3] - $temp[7];
unset($temp);
$label = "文字區域";
}
if( ($ground_w<$w) || ($ground_h<$h) )
{
echo "需要加水印的圖片的長度或寬度比水印".$label."還小,無法生成水印!";
return;
}
switch($waterPos)
{
case 0://隨機
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
case 1://1為頂端居左
$posX = 0;
$posY = 0;
break;
case 2://2為頂端居中
$posX = ($ground_w - $w) / 2;
$posY = 0;
break;
case 3://3為頂端居右
$posX = $ground_w - $w;
$posY = 0;
break;
case 4://4為中部居左
$posX = 0;
$posY = ($ground_h - $h) / 2;
break;
case 5://5為中部居中
$posX = ($ground_w - $w) / 2;
$posY = ($ground_h - $h) / 2;
break;
case 6://6為中部居右
$posX = $ground_w - $w;
$posY = ($ground_h - $h) / 2;
break;
case 7://7為底端居左
$posX = 0;
$posY = $ground_h - $h;
break;
case 8://8為底端居中
$posX = ($ground_w - $w) / 2;
$posY = $ground_h - $h;
break;
case 9://9為底端居右
$posX = $ground_w - $w;
$posY = $ground_h - $h;
break;
default://隨機
$posX = rand(0,($ground_w - $w));
$posY = rand(0,($ground_h - $h));
break;
}
//設定圖像的混色模式
imagealphablending($ground_im, true);
if($isWaterImage)//圖片水印
{
imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷貝水印到目標文件
}
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("水印文字顏色格式不正確!");
}
imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
}
//生成水印后的圖片
@unlink($groundImage);
switch($ground_info[2])//取得背景圖片的格式
{
case 1:imagegif($ground_im,$groundImage);break;
case 2:imagejpeg($ground_im,$groundImage);break;
case 3:imagepng($ground_im,$groundImage);break;
default:die($errorMsg);
}
//釋放內存
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");
//圖片水印
//$waterImage="./Hanweb_shuiyin.gif";//水印圖片路徑
//imageWaterMark($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="上傳">
</form</pre>