What is the recommended approach for handling form input in PHP, especially when using separate HTML and PHP files?

When handling form input in PHP, especially when using separate HTML and PHP files, it is recommended to use the POST method to send form data to the PHP file for processing. In the HTML form, set the form action to point to the PHP file handling the form submission. In the PHP file, check if the form has been submitted and then access the form data using the $_POST superglobal. 

// HTML form (form.html)
<form action="process_form.php" method="post">
  <input type="text" name="username">
  <input type="password" name="password">
  <input type="submit" value="Submit">
</form>
```

```php
// PHP file (process_form.php)
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $username = $_POST["username"];
  $password = $_POST["password"];
  
  // Process the form data here
}
?>

Keywords

form input PHP HTML separate files handling

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