function upload($uploadfile,$watermark=1,$watertype=1,$content){

foreach($uploadfile['name'] as $key=>$name) {  //多文件上传函数

uploadall($uploadfile,$key,$watermark,$watertype,$content);

}

}

function uploadall($uploadfile,$i,$watermark,$watertype,$content) {

$watermark=$watermark;         //是否附加水印(1为加水印,其他为不加水印);

$watertype=$watertype;         //水印类型(1为文字,2为图片)

$watercontent=$content;         //水印的内容

if(empty($uploadfile['name'][$i])) {

die("未选择文件上传");

}

if($uploadfile['error'][$i] == 2) {   //验证html判断结果

die("上传的文件太大了");

}

$allow_filemaxsize = 2048000;    // 2m

$filesize = $uploadfile['size'][$i];

if($filesize > $allow_filemaxsize) {

die("上传的文件太大了");

}

$allow_filetypes = array("jpeg", "gif", "png","jpg","pjpeg");//允许上传的文件统一资源类型 mimetype

$allow = false;        //默认都不允许

$mimetype = $uploadfile['type'][$i];  //上传文件的mime文件类型

foreach($allow_filetypes as $t) {

if(strpos($mimetype, $t) !== false) {

$allow = true;      //找到了符合上传条件的文件类型

break;

}

}

if($allow == false) {

die("上传的文件类型不被允许");

}

$result = is_uploaded_file($uploadfile['tmp_name'][$i]);   //判断是否为上传动作产生的

if(!$result) {

die("上传的文件有误");

}

$uploaddir = "img/";       //上传文件保存目录

if(!file_exists($uploaddir)) mkdir($uploaddir, 0777, true);//若上传保存目录不存在，则递归创建

/**重命名文件**/

$filetype = explode(".", $uploadfile['name'][$i]);

$filetype = array_pop($filetype);

$uploadfilename = time().".".$filetype;

$_session['filename'] = $uploadfilename;

//end

$result = move_uploaded_file($uploadfile['tmp_name'][$i], $uploaddir.$uploadfilename);

if($result) {

echo  "文件上传成功";

}else{

switch($uploadfile['error'][$i]) {

case 1:return "上传的文件超出了php.ini中设定的最大值";break;

case 2:return "上传的文件超出了html中设定的最大值";break;

case 3:return "文件只有部分被上传";break;

case 4;return "没有文件被上传";break;

default:die("文件上传失败");

}

}

if($watermark==1) {

$iinfo=getimagesize($uploaddir.$uploadfilename);  //获取图片的相关信息，得到数组

$nimage=imagecreatetruecolor($iinfo[0],$iinfo[1]);

$white=imagecolorallocate($nimage,255,255,255); //设置背景颜色为白色

$black=imagecolorallocate($nimage,0,0,0);  //设置背景颜色为黑色

$red=imagecolorallocate($nimage,255,0,0);  //设置背景颜色为红色

imagefill($nimage,0,0,$white);     //背景填充为白色

switch ($iinfo[2]) {

case 1:

$simage =imagecreatefromgif($uploaddir.$uploadfilename);

break;

case 2:

$simage =imagecreatefromjpeg($uploaddir.$uploadfilename);

break;

case 3:

$simage =imagecreatefrompng($uploaddir.$uploadfilename);

break;

case 6:

$simage =imagecreatefromwbmp($uploaddir.$uploadfilename);

break;

default:

die("不支持的文件类型");

exit;

}

imagecopy($nimage,$simage,0,0,0,0,$iinfo['0'],$iinfo['1']);

switch($watertype) {

case 1:             //加水印字符串

imagestring($nimage,5,$iinfo['0']/2-50,$iinfo['1']-30,$watercontent,$black);

break;

case 2:            //加水印图片

$simage1 =imagecreatefromgif($watercontent);

$size = getimagesize($watercontent);

imagecopy($nimage,$simage1,$iinfo['0']/2+50,$iinfo['1']-100,0,0,$size[0],$size[1]);

imagedestroy($simage1);

break;

}

switch ($iinfo[2]) {

case 1:

imagejpeg($nimage, $uploaddir.$uploadfilename); //将图像$nimage以$destination文件名创建一个jpeg的格式文件

break;

case 2:

imagejpeg($nimage, $uploaddir.$uploadfilename);

break;

case 3:

imagepng($nimage, $uploaddir.$uploadfilename);

break;

case 6:

imagewbmp($nimage, $uploaddir.$uploadfilename);

break;

}

imagedestroy($nimage);    //覆盖原上传文件

imagedestroy($simage);

}

}

if(@$_get['act'] == "insert") {    //未作参数校验

//该函数的四个参数分别是：上传控件的name值；是否加水印(1为加，其他数字为不佳)；

//水印的类型(1为字符串，2为图片)；水印的内容,字符串时写数据，图片时写图片的地址；

$picture = upload($_files['picture'],1,2,"img/watermark.gif");//上传文件，并返回上传后的文件路径名

}

?>