//得到上传文件的格式$attach_ext $pos=strrpos($_FILES['uploadfile']['name'],".");
if($pos===false){
$attach_ext="";
}else{
$attach_ext=".".strtolower(substr($_FILES['uploadfile']['name'],$pos+1));
}
if($pos===false){
$attach_ext="";
}else{
$attach_ext=".".strtolower(substr($_FILES['uploadfile']['name'],$pos+1));
}
$ar = explode(".",$filename);
$ext = $ar[1];