<!DOCTYPE html>
<html lang="en">
<head>
<title>W3docs</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
.gfg {
font-size: 40px;
font-weight: bold;
color: green;
}
body {
text-align: center;
}
</style>
</head>
<body>
<?php
if(!empty($_GET['submit'])) {
$var = empty($_GET['option1']) ? null : $_GET['option1'] ;
if($var){
echo "Option 1 submitted successfully";
}
}
?>
<div class="container">
<div class="gfg">W3docs</div>
<h2>Form control: checkbox</h2>
<p>The form below contains one checkbox.</p>
<form method="get" action="/form/submit">
<div class="checkbox">
<label> <input type="checkbox" name="option1" value="Option 1" />Option 1 </label>