What are the potential limitations of using the required attribute for form validation?

The potential limitation of using the required attribute for form validation is that it only checks for empty inputs and does not provide more specific validation rules like email format or minimum character length. To solve this, you can combine the required attribute with other validation techniques like PHP server-side validation to ensure all necessary criteria are met. 

if(isset($_POST['submit'])){
    $email = $_POST['email'];

    if(empty($email)){
        $errors[] = "Email is required.";
    } elseif(!filter_var($email, FILTER_VALIDATE_EMAIL)){
        $errors[] = "Invalid email format.";
    }

    if(empty($errors)){
        // Form submission logic
    } else {
        foreach($errors as $error){
            echo $error . "<br>";
        }
    }
}

Keywords

PHP form validation required attribute limitations error handling

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