Is using the required attribute in HTML forms enough to eliminate the need for isset() checks in PHP scripts?

Using the required attribute in HTML forms is helpful for client-side validation, but it does not eliminate the need for isset() checks in PHP scripts. The required attribute ensures that a field is not submitted empty, but it does not guarantee that the field will be set in the $_POST or $_GET arrays when the form is submitted. Therefore, isset() checks are still necessary in PHP to ensure that the required fields are not only filled out but also set in the request data. 

if(isset($_POST['submit'])) {
    if(isset($_POST['username']) && isset($_POST['password'])) {
        // Process form data
    } else {
        // Handle missing required fields
    }
}

Keywords

required attribute HTML forms isset() PHP scripts error types

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