简单表单输入类型提交和重置不起作用

Question

我一直尝试从Internet的不同线程尝试所有不同的想法，但是我似乎找不到任何想法，为什么我的表单将不提交或重置对数据所做的更改。该代码可以从数据库中提取数据，但是当我进行更改时，提交和重置按钮什么也不做。

//remove square braces from json string 
$json_output = str_replace('[','',$json_output);
echo $json_output = str_replace(']','',$json_output);

表单的操作与此链接：

<?php
session_start();
//check session first
if (!isset($_SESSION['employee_id'])){
    echo "You are not logged in!";
    exit();
}else{
    //include the header
    include ("../includes/managerheader.php");
    require_once ('../../mysqli_connect.php');
    $customer_id=$_GET['customer_id']; 
    $query = "SELECT * FROM customers WHERE customer_id=$customer_id"; 
    $result = @mysqli_query ($dbc, $query);
    $num = mysqli_num_rows($result);
    if ($num > 0) { // If it ran OK, display all the records.
        while ($row = mysqli_fetch_array($result, MYSQLI_ASSOC)){
?>
            <form action="customerupdate2.php" method="post">
            Customer ID: <input name="customer_id" size=50 value="<? echo $row['customer_id']; ?>"></br></br>
            First Name: <input name="first_name" size=50 value="<? echo $row['first_name']; ?>"><p>
            Last Name: <input name="last_name" size=50 value="<? echo $row['last_name']; ?>"><p>
            Email Address: <input name="email" size=50 value="<? echo $row['email']; ?>"><p>
            Password: <input name="password" size=50 value="<? echo $row['password']; ?>"><p>
            Address: <input name="address" size=50 value="<? echo $row['address']; ?>"><p>
            City: <input name="city" size=50 value="<? echo $row['city']; ?>"><p>
            State: <input name="state" size=50 value="<? echo $row['state']; ?>"><p>
            Zip: <input name="zip" size=50 value="<? echo $row['zip']; ?>"><p>
            Telephone: <input name="telephone" size=50 value="<? echo $row['telephone']; ?>"><p>
            Payment Type: <input name="payment_type" size=50 value="<? echo $row['payment_type']; ?>"><p>
            Card Number: <input name="card_number" size=50 value="<? echo $row['card_number']; ?>"><p>
            <input type="submit" value="update">
            <input type="reset" value="reset">
            <input type="hidden" name="customer_id" value="<? echo $row['customer_id']; ?>">
            </form>
<?
        } //end while statement
    } //end if statement
    mysqli_close($dbc);
    //include the footer
    include ("../includes/footer.php");
}
?>