How can separating form and save files in PHP help in avoiding unintended database entries when submitting form data?

Separating form and save files in PHP can help avoid unintended database entries when submitting form data by ensuring that the database query is only executed when the form data is valid and intended to be saved. This separation allows for validation and sanitization of the form data before it is processed and saved into the database, reducing the risk of unintended or malicious entries. 

// form.php
<form action="save.php" method="post">
  <input type="text" name="username" placeholder="Username">
  <input type="email" name="email" placeholder="Email">
  <button type="submit">Submit</button>
</form>
```

```php
// save.php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  // Validate and sanitize form data
  $username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
  $email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
  
  // Save data into database
  // $db->query("INSERT INTO users (username, email) VALUES ('$username', '$email')");
}

Keywords

PHP form submission database entries file separation data validation

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