mysql-PHP中这个语句imagejpeg($newim,$name);提示没有权限？

背景：

我用的是新浪云SAE，求帮忙看一下，多谢各位了。

错误提示：

Warning: imagejpeg() [function.imagejpeg]: Unable to open '123.jpg' for writing: Permission denied in 3.php on line 86

错误对应代码：

    imagejpeg($newim,$name);

全部代码：

     
';    echo '

';    echo "Image url:
".https://www.gxlcms.com/$url."
";    echo "";}function resizeImage($im,$maxwidth,$maxheight,$name,$filetype){    $pic_width = imagesx($im);    $pic_height = imagesy($im);    if(($maxwidth && $pic_width > $maxwidth) || ($maxheight && $pic_height > $maxheight))    {        if($maxwidth && $pic_width>$maxwidth)        {            $widthratio = $maxwidth/$pic_width;            $resizewidth_tag = true;        }        if($maxheight && $pic_height>$maxheight)        {            $heightratio = $maxheight/$pic_height;            $resizeheight_tag = true;        }        if($resizewidth_tag && $resizeheight_tag)        {            if($widthratio<$heightratio)                $ratio = $widthratio;            else                $ratio = $heightratio;        }        if($resizewidth_tag && !$resizeheight_tag)            $ratio = $widthratio;        if($resizeheight_tag && !$resizewidth_tag)            $ratio = $heightratio;        $newwidth = $pic_width * $ratio;        $newheight = $pic_height * $ratio;        if(function_exists("imagecopyresampled"))        {            $newim = imagecreatetruecolor($newwidth,$newheight);           imagecopyresampled($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);        }        else        {            $newim = imagecreate($newwidth,$newheight);           imagecopyresized($newim,$im,0,0,0,0,$newwidth,$newheight,$pic_width,$pic_height);        }        $name = $name.$filetype;        //imagejpeg($newim,"http://lapiao-lapiao.stor.sinaapp.com/uploads/jpg.jpg");        //imagejpeg($newim,"saestor://lapiao/uploads/");        imagejpeg($newim,$name);        echo $newim;        echo '
';        echo $name;        imagedestroy($newim);    }    else    {        $name = $name.$filetype;        imagejpeg($im,$name);    }           }//$im=imagecreatefromjpeg("saestor:/".$_FILES["file"]["tmp_name"]);//参数是图片的存方路径$im=imagecreatefromjpeg("https://www.gxlcms.com/$url");//参数是图片的存方路径$maxwidth="50";//设置图片的最大宽度$maxheight="50";//设置图片的最大高度$name="123";//图片的名称，随便取吧$filetype=".jpg";//图片类型resizeImage($im,$maxwidth,$maxheight,$name,$filetype);//调用上面的函数?>