php加水印，php縮略圖

//原文件,新文件,寬度,高度,維持比例
function ResizeImage($big_image_name, $new_name, $max_width = 400, $max_height = 400, $resize = 1){
    $returnr['file']='';
    $returnr['filetype']='';
    if($temp_img_type = @getimagesize($big_image_name)) {eregi('/([a-z]+)$', $temp_img_type[mime], $tpn); $img_type = $tpn[1];}
    else {eregi('.([a-z]+)$', $big_image_name, $tpn); $img_type = $tpn[1];}
    $all_type = array(
        "jpg"   => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
        "gif"   => array("create"=>"ImageCreateFromGIF" , "output"=>"imagegif"   , "exn"=>".gif"),
        "jpeg"  => array("create"=>"ImageCreateFromjpeg", "output"=>"imagejpeg"  , "exn"=>".jpg"),
        "png"   => array("create"=>"imagecreatefrompng" , "output"=>"imagepng"   , "exn"=>".png"),
        "wbmp"  => array("create"=>"imagecreatefromwbmp", "output"=>"image2wbmp" , "exn"=>".wbmp")
    );

    $func_create = $all_type[$img_type]['create'];
    if(empty($func_create) or !function_exists($func_create))
    {
        return $returnr;
    }
    //輸出
    $func_output = $all_type[$img_type]['output'];
    $func_exname = $all_type[$img_type]['exn'];
    if(($func_exname=='.gif'||$func_exname=='.png'||$func_exname=='.wbmp')&&!function_exists($func_output))
    {
        $func_output='imagejpeg';
        $func_exname='.jpg';
    }
    $big_image   = $func_create($big_image_name);
    $big_width   = imagesx($big_image);
    $big_height  = imagesy($big_image);
    if($big_width <= $max_width and $big_height <= $max_height)
    {
        $func_output($big_image, $new_name.$func_exname);
        $returnr['file']=$new_name.$func_exname;
        $returnr['filetype']=$func_exname;
        return $returnr;
    }
    $ratiow      = $max_width  / $big_width;
    $ratioh      = $max_height / $big_height;
    if($resize == 1) {
        if($big_width >= $max_width and $big_height >= $max_height)
        {
            if($big_width > $big_height)
            {
            $tempx  = $max_width / $ratioh;
            $tempy  = $big_height;
            $srcX   = ($big_width - $tempx) / 2;
            $srcY   = 0;
            } else {
            $tempy  = $max_height / $ratiow;
            $tempx  = $big_width;
            $srcY   = ($big_height - $tempy) / 2;
            $srcX   = 0;
            }
        } else {
            if($big_width > $big_height)
            {
            $tempx  = $max_width;
            $tempy  = $big_height;
            $srcX   = ($big_width - $tempx) / 2;
            $srcY   = 0;
            } else {
            $tempy  = $max_height;
            $tempx  = $big_width;
            $srcY   = ($big_height - $tempy) / 2;
            $srcX   = 0;
            }
        }
    } else {
        $srcX      = 0;
        $srcY      = 0;
        $tempx     = $big_width;
        $tempy     = $big_height;
    }

    $new_width  = ($ratiow  > 1) ? $big_width  : $max_width;
    $new_height = ($ratioh  > 1) ? $big_height : $max_height;
    if(function_exists("imagecopyresampled"))
    {
        $temp_image = imagecreatetruecolor($new_width, $new_height);
        imagecopyresampled($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
    } else {
        $temp_image = imagecreate($new_width, $new_height);
        imagecopyresized($temp_image, $big_image, 0, 0, $srcX, $srcY, $new_width, $new_height, $tempx, $tempy);
    }
        $func_output($temp_image, $new_name.$func_exname);
        ImageDestroy($big_image);
        ImageDestroy($temp_image);
        $returnr['file']=$new_name.$func_exname;
        $returnr['filetype']=$func_exname;
    return $returnr;
}

/*
* 功能：圖片加水印 (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爲隨機位置；
*                        1爲頂端居左，2爲頂端居中，3爲頂端居右；
*                        4爲中部居左，5爲中部居中，6爲中部居右；
*                        7爲底端居左，8爲底端居中，9爲底端居右；
*      $waterImage        圖片水印，即作爲水印的圖片，暫只支持GIF,JPG,PNG格式；
*      $waterText        文字水印，即把文字作爲爲水印，支持ASCII碼，不支持中文；
*      $textFont        文字大小，值爲1、2、3、4或5，默認爲5；
*      $textColor        文字顏色，值爲十六進制顏色值，默認爲#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。
*      加水印後的圖片的文件名和 $groundImage 一樣。
*/
function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000",$myfontpath="../data/mask/cour.ttf",$w_pct,$w_quality){
    global $fun_r;
    $isWaterImage = FALSE;
    $formatMsg = $fun_r['synotdotype'];

    //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:echo $formatMsg;return "";
        }
    }

    //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:echo $formatMsg;return "";
        }
    }
    else
    {
        echo $fun_r['synotdoimg'];
        return "";
    }

    //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*2.5),0,$myfontpath,$waterText);//取得使用 TrueType 字體的文本的範圍
        $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 $fun_r['sytoosmall'];
        return '';
    }
    switch($waterPos)
    {
        case 0://隨機
            $posX = rand(0,($ground_w - $w));
            $posY = rand(0,($ground_h - $h));
            break;
        case 1://1爲頂端居左
            $posX = 0;
            $posY = 0;
            break;
        case 2://2爲頂端居中
            $posX = ($ground_w - $w) / 2;
            $posY = 0;
            break;
        case 3://3爲頂端居右
            $posX = $ground_w - $w;
            $posY = 0;
            break;
        case 4://4爲中部居左
            $posX = 0;
            $posY = ($ground_h - $h) / 2;
            break;
        case 5://5爲中部居中
            $posX = ($ground_w - $w) / 2;
            $posY = ($ground_h - $h) / 2;
            break;
        case 6://6爲中部居右
            $posX = $ground_w - $w;
            $posY = ($ground_h - $h) / 2;
            break;
        case 7://7爲底端居左
            $posX = 0;
            $posY = $ground_h - $h;
            break;
        case 8://8爲底端居中
            $posX = ($ground_w - $w) / 2;
            $posY = $ground_h - $h;
            break;
        case 9://9爲底端居右
            $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($isWaterImage)//圖片水印
    {
        imagecopymerge($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h,$w_pct);//拷貝水印到目標文件         
    }
    else//文字水印
    {
        if( !empty($textColor) && (strlen($textColor)==7) )
        {
            $R = hexdec(substr($textColor,1,2));
            $G = hexdec(substr($textColor,3,2));
            $B = hexdec(substr($textColor,5));
        }
        else
        {
            echo $fun_r['synotfontcolor'];
            return "";
        }
        imagestring ( $ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));         
    }

    //生成水印後的圖片
    @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,$w_quality);break;
        case 3:imagepng($ground_im,$groundImage);break;
        default:echo $formatMsg;return "";
    }

    //釋放內存
    if(isset($water_info)) unset($water_info);
    if(isset($water_im)) imagedestroy($water_im);
    unset($ground_info);
    imagedestroy($ground_im);
}
?>