php 图片水印+文字水印函数，但是不能设置透明

<?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>