一个简单的利用POST方法上传文件

请选择您要上传的文件：

<form method="post" action ="index.php" enctype="multipart/form-data">

    <input type="hidden" name="action" value='upload' />

    <input type="file" name="u_file" />

    <input type="submit" value="上传" />

<form>

<?php

       $date=md5(time());

       if($_POST[action]=="upload"){

         if($_FILES[u_file][size]>"300000"){

            echo "文件上传过大，请重新选择!";

           }else if($_FILES[u_file][tmp_name]){

            move_uploaded_file($_FILES[u_file][tmp_name],

                "./mkbook//$date".$_FILES[u_file][name]);

            echo "文件上传成功";

        }else{

            echo "文件上传失败";

        }

       }

?>