表单：

<form id ="form1" method="POST" enctype="multipart/form-data" >
<input name ="room_logo" type="file"  value="" id ="room_logo" class="input normal"   sucmsg=" " />
</form>

注意：表单上要加 enctype=”multipart/form-data” 

PHP处理代码：

<?php
$method = $_SERVER['REQUEST_METHOD' ];
if ($method == 'POST') { 
    $destination_folder ="../../uploads/"; //上传文件路径
    //是否存在文件
    if ( is_uploaded_file($_FILES ["room_logo"]["tmp_name" ])) {       
        $file = $_FILES["room_logo" ];
        if(!file_exists( $destination_folder )) {
            mkdir ($destination_folder);
        }
        $filename=$file["tmp_name"];
        $pinfo=pathinfo( $file["name" ]);
        $ftype=$pinfo['extension'];
        $destination = $destination_folder.time(). ".".$ftype ;
        if(!move_uploaded_file ($filename, $destination)){
            echo " 移动文件出错 ";
        }              
    }
}

?>