无法将用户文件发送到wordpress上的php脚本

在主页上，我接受了一个文件输入，即

form action = "Results" method = "post"

 input type = "file" name="file_name"

 input type = "submit" value="Upload"

/form 

在结果页面上，我编写了一个php代码来读取其内容

?php

$file = $_POST["file_name"];

$fp = fopen($file, 'r');  

if($fp == NULL){

    echo '<h2> File not found !!!</h2>';
}
else {

   $line = fread($fp,filesize($file));
        ...
     }

fclose($fp);

?

我已经在我的网站上安装了exec php插件，但我无法找出错误。

听起来像

1) No any file was uploaded to the temp directory
2) You have to check the upload_max_filesize of your server. (run phpinfo() and check)
3) Just `print_r($_FILE)` to check what is the error?

1) No any file was uploaded to the temp directory
2) You have to check the upload_max_filesize of your server. (run phpinfo() and check)
3) Just `print_r($_FILE)` to check what is the error?