Insert and update checkbox value in PHP and MySQL

Tech Area
Last updated on: January 8, 2026

In this tutorials, We will learn how to insert and update checkbox value into database using PHP and MySQL. We have used three checkbox for language.

Files used in this tutorial:

1- connection.php (database connection file)

2- index.php (registration form with checkbox)

3- show-details.php (fetch and show data)

4- edit-details.php (update data)

Below are the step by step process of how to insert and update checkbox value in PHP and MySQL.

Step 1: Create a Database connection

In this step, create a new file connection.php to create database connection.

connection.php

<?php
$server = "localhost";
$username = "root";
$password = "";
$database = "college_db";
$connection = mysqli_connect("$server","$username","$password");
$select_db = mysqli_select_db($connection, $database);
if(!$select_db)
{
	echo("connection terminated");
}
?>

Step 2: Create Registration form

In this step, create a new file index.php. This is the main file used to create registration form and insert value into database.

This screenshot shows the registration form with checkbox.

index.php

<html>  
<head>  
    <title>Registration Form</title>  
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />  
</head>
<style>
 .box
 {
  width:100%;
  max-width:600px;
  background-color:#f9f9f9;
  border:1px solid #ccc;
  border-radius:5px;
  padding:16px;
  margin:0 auto;
 }
 .error
{
  color: red;
  font-weight: 700;
} 
</style>
<?php
include('connection.php');
if(isset($_REQUEST['register']))
{
  $name = $_REQUEST['name'];
  $email = $_REQUEST['email'];
  $language = implode(", ",$_REQUEST['language']);
  $insert_query = mysqli_query($connection,"insert into tbl_registration set name='$name', emailid='$email', language='$language'");
  if($insert_query>0)
  {
    $msg = "Data inserted.";
  }
  else
  {
    $msg = "Error!";
  }
}
?>
<body>  
    <div class="container">  
    <div class="table-responsive">  
    <h3 align="center">Registration Form</h3>
    <a href="show-details.php">View Details</a>
     <div class="box">
     <form method="post">
     <div class="form-group">
       <label for="name">Enter Your Name</label>
       <input type="text" name="name" id="name" placeholder="Enter Name" required class="form-control"/>
      </div>  
       <div class="form-group">
       <label for="email">Enter Your Email</label>
       <input type="email" name="email" id="email" placeholder="Enter Email" required class="form-control"/>
      </div>
      <div class="form-group">
       <label for="language">Select Language</label><br>
       <input type="checkbox" name="language[]" id="language" value="PHP"/> PHP
       <input type="checkbox" name="language[]" id="language" value="Java"/> Java
       <input type="checkbox" name="language[]" id="language" value=".NET"/> .NET
      </div>
      <div class="form-group">
       <input type="submit" id="register" name="register" value="Submit" class="btn btn-success" />
       </div>
       <p class="error"><?php if(!empty($msg)){ echo $msg; } ?></p>
     </form>
     </div>
   </div>  
  </div>
 </body>  
</html>

Step 3: Fetch and Show data

In this step, create a new file show-details.php. This file is used to fetch and show data from the database.

show-details.php

<style>
table {
  font-family: arial, sans-serif;
  border-collapse: collapse;
  width: 50%;
}

td, th {
  border: 1px solid #dddddd;
  text-align: left;
  padding: 8px;
}

tr:nth-child(even) {
  background-color: #dddddd;
}
</style>
<table>
  <tr>
    <th>Name</th>
    <th>EmailId</th>
    <th>Language</th>
    <th>Action</th>
   </tr>
  
  <?php
  include('connection.php');
  $select_query = mysqli_query($connection,"select * from tbl_registration");
  while($result = mysqli_fetch_array($select_query)){
  ?>
  <tr>
  <td><?php echo $result['name']; ?></td>
  <td><?php echo $result['emailid']; ?></td>
  <td><?php echo $result['language']; ?></td>
  <td><a href="edit-details.php?ids=<?php echo $result['id'];?>">Edit</a></td>
  </tr>
  <?php } ?>
 </table>

Step 4: Update form data

In this step, create a new file edit-details.php. This file is used to update form data.

edit-details.php

<html>  
<head>  
    <title>Registration Form</title>  
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />  
</head>
<style>
 .box
 {
  width:100%;
  max-width:600px;
  background-color:#f9f9f9;
  border:1px solid #ccc;
  border-radius:5px;
  padding:16px;
  margin:0 auto;
 }
 .error
{
  color: red;
  font-weight: 700;
} 
</style>
<body>  
    <div class="container">  
    <div class="table-responsive">  
    <h3 align="center">Registration Form</h3><br/>
    <a href="show-details.php">View Details</a>
    <div class="box">
      <?php
      include('connection.php');
      $ids = $_GET['ids'];
      if(isset($_REQUEST['update']))
      {
        $name = $_REQUEST['name'];
        $email = $_REQUEST['email'];
        $language = implode(", ",$_REQUEST['language']);

        $update_query = mysqli_query($connection,"update tbl_registration set name='$name', emailid='$email', language='$language' where id='$ids'");
        if($update_query>0)
        {
          $msg = "Data updated successfully.";
        }
        else
        {
          $msg = "Error!";
        }
      }
      $select_query = mysqli_query($connection,"select * from tbl_registration where id='$ids'");
      while($res = mysqli_fetch_array($select_query)){
      $lang = explode(", ",$res['language']);
      ?>
     <form method="post" >
     <div class="form-group">
       <label for="name">Enter Your Name</label>
       <input type="text" name="name" id="name" placeholder="Enter Name" required class="form-control" value="<?php echo $res['name']; ?>"/>
      </div>  
       <div class="form-group">
       <label for="email">Enter Your Email</label>
       <input type="email" name="email" id="email" placeholder="Enter Email" required class="form-control" value="<?php echo $res['emailid']; ?>"/>
      </div>
      <div class="form-group">
       <label for="language">Select Language</label><br>
       <input type="checkbox" name="language[]" id="language" value="PHP" <?php if(in_array("PHP", $lang)){ echo "checked"; } ?>/> PHP
       <input type="checkbox" name="language[]" id="language" value="Java" <?php if(in_array("Java", $lang)){ echo "checked"; } ?>/> Java
       <input type="checkbox" name="language[]" id="language" value=".NET" <?php if(in_array(".NET", $lang)){ echo "checked"; } ?>/> .NET
      </div>
      <div class="form-group">
       <input type="submit" id="update" name="update" value="Update" class="btn btn-success"/>
       </div>
       <p class="error"><?php if(!empty($msg)){ echo $msg; } ?></p>
     </form>
   <?php } ?>
    </div>
   </div>  
  </div>
 </body>  
</html>