What are the best practices for designing forms with multiple submit buttons in PHP to avoid unexpected behavior?

When designing forms with multiple submit buttons in PHP, it is important to differentiate between the buttons to handle each action separately. One common approach is to include a hidden input field that stores the action to be performed when the form is submitted. This way, you can check the value of this input field in your PHP code to determine which action to take. 

<form method="post" action="process_form.php">
  <input type="text" name="username" placeholder="Username">
  <input type="password" name="password" placeholder="Password">
  
  <input type="submit" name="action" value="login">
  <input type="submit" name="action" value="register">
</form>
```

```php
// process_form.php

if(isset($_POST['action'])){
  $action = $_POST['action'];
  
  if($action == 'login'){
    // Handle login action
  } elseif($action == 'register'){
    // Handle register action
  }
}

Keywords

PHP forms multiple submit buttons behavior design

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