Enable Users to Edit Their Profiles on WordPress Frontend

Code

<?php
// Hook to add a shortcode for the user profile form
add_shortcode('wp-dudecom_user_profile_form', 'wp_dudecom_user_profile_form_shortcode');

// Function to display the user profile form
function wp_dudecom_user_profile_form_shortcode() {
    if (!is_user_logged_in()) {
        return '<p>You need to be logged in to edit your profile.</p>';
    }

    $user_id = get_current_user_id();
    $user_info = get_userdata($user_id);

    if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['wp_dudecom_update_profile'])) {
        wp_dudecom_handle_profile_update($user_id);
    }

    ob_start();
    ?>
    <form method="post">
        <p>
            <label for="wp_dudecom_first_name">First Name</label>
            <input type="text" name="wp_dudecom_first_name" id="wp_dudecom_first_name" value="<?php echo esc_attr($user_info->first_name); ?>" />
        </p>
        <p>
            <label for="wp_dudecom_last_name">Last Name</label>
            <input type="text" name="wp_dudecom_last_name" id="wp_dudecom_last_name" value="<?php echo esc_attr($user_info->last_name); ?>" />
        </p>
        <p>
            <label for="wp_dudecom_email">Email</label>
            <input type="email" name="wp_dudecom_email" id="wp_dudecom_email" value="<?php echo esc_attr($user_info->user_email); ?>" />
        </p>
        <p>
            <input type="submit" name="wp_dudecom_update_profile" value="Update Profile" />
        </p>
    </form>
    <?php
    return ob_get_clean();
}

// Function to handle profile update
function wp_dudecom_handle_profile_update($user_id) {
    if (!isset($_POST['wp_dudecom_update_profile'])) {
        return;
    }

    // Verify nonce for security
    if (!wp_verify_nonce($_POST['_wpnonce'], 'wp_dudecom_update_profile')) {
        return;
    }

    $first_name = sanitize_text_field($_POST['wp_dudecom_first_name']);
    $last_name = sanitize_text_field($_POST['wp_dudecom_last_name']);
    $email = sanitize_email($_POST['wp_dudecom_email']);

    // Validate email
    if (!is_email($email)) {
        echo '<p>Invalid email address.</p>';
        return;
    }

    // Update user data
    wp_update_user(array(
        'ID' => $user_id,
        'first_name' => $first_name,
        'last_name' => $last_name,
        'user_email' => $email
    ));

    echo '<p>Profile updated successfully.</p>';
}
?>