<?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>
