Php 无法通过html表单更新Mysql数据库中的一列

我真的希望你能帮我解决我的问题。我已经完成了我的表格，所有的按钮都在工作，一切都很顺利，但今天我决定在我的表格中增加一列。列被称为“国家”。现在，我所有的按钮都还在工作，数据添加或更新没有问题，除了那一列。没什么，但我可以从那个列中检索数据，不麻烦。不知道我在哪里搞砸了。这是我第一次接触php和mysql，所以如果我犯了一些愚蠢的错误，请原谅我。你能帮我吗

    <?php

     //adding functions
     function initVars() {
      //declaring variables
     global $ID, $First_name, $Last_name, $Address,$Country,
                     $Ph_number,$add,$find,$reset, $delete,     
                     $update, $next, $previous;

    $ID="";
    $First_name = "";
    $Last_name="";
    $Address = "";
    $Country="";
    $Ph_number="";
    $add = "";
    $find = "";
    $reset="";
    $delete="";
    $update="";
    $next="";
     $previous="";
    }

    initVars();

    function getRecord($query,$resultOffset){

    global $ID, $First_name, $Last_name, $Address,$Country, $Ph_number;
    $result = mysql_query($query);
    $resultCount = mysql_num_rows($result);
        echo "FOUND ", $resultCount, " RESULTS";//3
        $r=0;
        while ($r <= $resultOffset) {
              $rec = mysql_fetch_assoc($result);
            $r = $r + 1;
          }
        $ID=$rec['ID'];
        $First_name = $rec['First_name'];
        $Last_name = $rec['Last_name'];
        $Address = $rec['Address'];
        $Country= $rec['Country'];
        $Ph_number = $rec['Ph_number'];
        return($resultCount);
    }
    // collecting form input
    if ( isset($_POST['First_name'])) $First_name = $_POST['First_name'];
    if ( isset($_POST['Last_name'])) $Last_name = $_POST['Last_name'];
    if ( isset($_POST['Address'])) $Address = $_POST['Address'];
    if ( isset($_POST['Country'])) $$Country = $_POST['Country'];
    if ( isset($_POST['Ph_number'])) $Ph_number = $_POST['Ph_number'];
    if ( isset($_POST['add'])) $add = $_POST['add'];
    if ( isset($_POST['find'])) $find = $_POST['find'];
    if ( isset($_POST['reset'])) $reset = $_POST['reset'];
    if ( isset($_POST['delete'])) $delete = $_POST['delete'];
    if ( isset($_POST['update'])) $update = $_POST['update'];
    if ( isset($_POST['ID'])) $ID = $_POST['ID'];
    if ( isset($_POST['next'])) $next = $_POST['next'];
    if ( isset($_POST['previous'])) $previous = $_POST['previous'];

    if ( isset($_POST['resultOffset'])) $resultOffset = $_POST['resultOffset'];
    if ( isset($_POST['resultCount'])) $resultCount = $_POST['resultCount'];
    if ( isset($_POST['query'])) $query = $_POST['query'];


    // connecting to database
          $connection = mysql_connect('localhost', 'root', '*******')
          or die('Connection to MySql server failed');
           $db = mysql_select_db('myaddressbook', $connection)
        or die('Cannot connect');


    //////////////////////////////////////////////////////////////////////////////

    //BUTTONS

     if ( $add ) {
      if($First_name && $Last_name) {
        echo 'Adding to database'; 

        // adding records to database
        $ins = mysql_query("INSERT INTO people SET First_name='$First_name',       
                Last_name='$Last_name',
        Address='$Address', Country='$Country',Ph_number='$Ph_number'");

         if($ins) echo "Your address book was updated succesfully";
        else echo "Adding data failed";
        initVars(); 

    }
    else echo 'First and last name needed';

    }
    ////////////////////////////////////////////////////////////////////////
    if ( $find ) {
        if($First_name || $Last_name) {

    $query = " SELECT ID, First_name, Last_name, Address , Ph_number FROM people   WHERE  
    First_name LIKE '%{$First_name}%'";
    $result = mysql_query($query);//1
    $resultCount = mysql_num_rows($result);//2
    $resultOffset= 0;
    echo "FOUND ", $resultCount, " RESULTS";//3

    $rows = mysql_fetch_array($result, MYSQL_ASSOC);

    $ID=$rows['ID'];
    $First_name = $rows['First_name'];
    $Last_name = $rows['Last_name'];
    $Address = $rows['Address'];
    $Country= $rows['Country'];
    $Ph_number = $rows['Ph_number'];

    }
    else echo "Enter required field";
    }

     /////////////////////////////////////////////////////////////////

    if ($delete){

     mysql_query(" DELETE   FROM people  WHERE ID = '{$ID}'  ");

     echo('Record deleted'); 

     } 

    //////////////////////////////////////////////////////////////////////
    if ($update){ 

      mysql_query ("UPDATE people 
      SET  First_name='$First_name',
      Last_name='$Last_name',Address='$Address',Country='$Country', Ph_number='$Ph_number' 
      WHERE ID = '{$ID}'"); 
               echo ('Update succesfull');
    }


    /////////////////////////////////////////////////////
    if ($reset){
    initVars();
     }
     /////////////////////////////////////////////////////////////
    if($next){
     if ($resultOffset < $resultCount - 1){
         $resultOffset= $resultOffset + 1;

        $resultCount=getRecord($query,$resultOffset);

    }
    echo "next ", $resultOffset, " of ", $resultCount;
    }

    if ($previous){
    if ($resultOffset > 0){
        $resultOffset= $resultOffset - 1;

         $resultCount=getRecord($query,$resultOffset);

    }   
    echo "prev ", $resultOffset, " of ", $resultCount;

    }


     mysql_close($connection);
     ?> 

And my piece of HTML:

    <html>
    <head><h1 align="center">
    My Address Book </h1>
    <hr></br></br></br>
     </head>

    <body style="color: #000; background-color:#e0e2e6; background-image:url(C:/Users/Marta
    /Desktop/old.jpg);">

    <form action="people.php" method="post">
    <table "width="500"; border="0"; align="center">
    <tr>
    <th>ID:</th>
    <td><label for="textfield"></label>
    <input  type="text"name="ID" size="50" value="<?php echo $ID ?>"/></td>
    <tr><th>First Name:</th>
    <td><input type="text" name="First_name" size="50" value="<?php echo $First_name ?>"   
    /></td></tr>
    <tr><th>Last Name:</th>
    <td><input type="text" name="Last_name" size="50" value="<?php echo $Last_name ?>" 
    /></td></tr>
    <tr><th>Address:</th>
    <td><input type="text" name="Address" size="50" value="<?php echo $Address ?>" /></td> 
    </tr>
    <tr><th>Country:</th>
    <td><input type="text" name="Country" size="50" value="<?php echo $Country ?>" /></td> 
    </tr>
    <tr><th>Ph number:</th>
    <td><input type="text" name="Ph_number" size="50" value="<?php echo $Ph_number ?>" 
    /></td></tr></table>
    <hr>
    <table align="center">
    <tr><td>

    <td><input type="submit" name="find" value="Find" /></td>
    <td><input type="submit" name="add" value="Add" /></td>
    <td><input type="submit" name="delete" value="Delete"/></td>
    <td><input type="submit" name="update" value="Update"/></td>
    <td><input type="submit" name="previous" value="<< Previous" /></td>
    <td><input type="submit" name="next" value="Next >>" /></td>

    <td align="center" colspan="3"><input type="submit" name="reset" value="Reset"/>
    </td></tr></table>
    <input type="hidden" id="resultOffset" name="resultOffset" value="<?php echo   
    $resultOffset ?>">
    <input type="hidden" id="resultCount" name="resultCount" value="<?php echo 
    $resultCount ?>">
   <input type="hidden" id="query" name="query" value="<?php echo $query ?>">
   </form>
   </body>
   </html>

---

更改代码：
$Country=$\u POST['Country']而不是
$$Country=$\u POST['Country']
$$Country=$\u POST['Country']-开始时你有一个太多的
$
。哦，天啊。我以为这会是件愚蠢的事。现在一切都好了，谢谢你，安德鲁。你让我开心；）我想我们都做过类似的事情，只是有点不同，但别忘了在某个时候验证/清理你的输入。为什么所有的全局变量？我会说我的眼睛太痛了。谢谢Vipul