Is it possible to nest multiple forms within each other in HTML, and how does this affect form submission and data processing in PHP?

Nesting multiple forms within each other in HTML is not valid according to the HTML specification. Instead, you can use hidden input fields within a single form to capture and submit multiple sets of data. In PHP, you can access the values of these hidden input fields using the $_POST superglobal array during form submission. 

<form method="post" action="process.php">
    <input type="text" name="username" placeholder="Username">
    <input type="password" name="password" placeholder="Password">
    <input type="hidden" name="data1" value="value1">
    <input type="hidden" name="data2" value="value2">
    <button type="submit">Submit</button>
</form>
```

In `process.php`:

```php
<?php
$username = $_POST['username'];
$password = $_POST['password'];
$data1 = $_POST['data1'];
$data2 = $_POST['data2'];

// Process the form data here
?>

Keywords

HTML forms nesting submission PHP

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