<?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 , "./1.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 );
}
imageWaterMark ( "1.jpg" , 0 , "watermark.gif" , "http://www.qltv.com.cn" , 5 , "#FF0000" );
//---------------------------------------------------------------------------------------
/*
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 ( $uploadfile , 0 , "" , "http://www.qltv.com.cn" , 5 , "#FF0000" );
//图片水印
//$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>
