php實現多圖片水印

<?php

function imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000") 
{ 
    $isWaterImage = FALSE; 
    $formatMsg = "暫不支持該文件格式，請用圖片處理軟件將圖片轉換爲GIF、JPG、PNG格式。";
    //讀取水印文件 
    if(!empty($waterImage) && file_exists($waterImage)) 
    { 
        $isWaterImage = TRUE; 
        $water_info = getimagesize($waterImage); //得到的是一個數組
        $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; //將圖片轉化爲PHP可識別的編碼過程
            case 2:$water_im = imagecreatefromjpeg($waterImage);break; //將圖片轉化爲PHP可識別的編碼過程
            case 3:$water_im = imagecreatefrompng($waterImage);break; //將圖片轉化爲PHP可識別的編碼過程
            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*2.5),0,"c:/windows/fonts/stcaiyun.ttf",$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<$h) ) 
    { 
        echo "需要加水印的圖片的長度或寬度比水印".$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($isWaterImage)//圖片水印 
    { 
        imagecopy($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,$groundImage);break; //創建gif格式的圖片
        case 2:imagejpeg($ground_im,$groundImage);break; //創建jpeg格式的圖片
        case 3:imagepng($ground_im,$groundImage);break; //創建png格式的圖片
        default:die($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); 
}


?>

<?php

for ($i=0;$i<count($_FILES['userfile']['tmp_name']);$i++)

{

$upfile="./img/".($i+1).".png";//此處路徑換成你的

if(move_uploaded_file($_FILES['userfile']['tmp_name'][$i],$upfile)){
imageWaterMark($upfile,9,"./shuiyin.png","Made By Chenduan",5,"#FF0000");
/* 
* 功能：圖片水印 (水印支持圖片或文字) 
* imageWaterMark($groundImage,$waterPos=0,$waterImage="",$waterText="",$textFont=5,$textColor="#FF0000") 
* 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； 
*      $textColor        文字顏色，值爲十六進制顏色值，默認爲#FF0000(紅色)； 
*/ 
echo "<img src=\"".$upfile."\" border=\"0\">"; 
echo "第".($i+1)."張圖片操作成功<br>";

}

else{

echo "第".($i+1)."張圖片上傳不了<br>";

}

}

?>