[WordPress] Secure WordPress Form Submission: An Object-Oriented Approach

00-function-signature.php

<?php
protected function verifyRequest($nonce, $action);

00-verify-request-1.php

<?php
protected function verifyRequest($nonce, $action)
{
    return isset($_GET[$nonce]) &&
           wp_verify_nonce(strip_tags(stripslashes($_GET[$nonce])), $action);
}

02-verify-request-2.php

<?php
protected function verifyRequest($nonce, $action)
{
    return
        (
            isset($_GET[$nonce]) &&
            wp_verify_nonce(strip_tags(stripslashes($_GET[$nonce])), $action)
        ) ||
        (
            isset($_POST[$nonce]) &&
            wp_verify_nonce(strip_tags(stripslashes($_POST[$nonce])), $action)
        );
}

03-verify-post-request.php

<?php
private function verifyPostRequest($nonce, $action)
{
    return
        isset($_POST[$nonce]) &&
        wp_verify_nonce(strip_tags(stripslashes(filter_input(INPUT_POST, $nonce))), $action);
}

04-verify-get-request.php

<?php
private function verifyGetRequest($nonce, $action)
{
    return
        isset($_GET[$nonce]) &&
        wp_verify_nonce(strip_tags(stripslashes(filter_input(INPUT_GET, $nonce))), $action);
}

05-verify-request-factory.php

<?php
protected function verifyRequest($nonce, $action)
{
    switch (strtolower($_SERVER['REQUEST_METHOD'])) {
        case 'post':
            return $this->verifyPostRequest($nonce, $action);
            break;
        case 'get':
            return $this->verifyGetRequest($nonce, $action);
            break;
        default:
            return false;
            break;
    }
}