Learn WP - Contact Form Workshop Code

wp-contact-form.php

<?php
/**
 * Plugin Name: WP Contact Form
 * Description: WordPress Contact Form
 * Version: 1.0.0
 * Author: Lax, Jon
 * Plugin URI: https://github.com/lax-mariappan/wp-contact-form
 * Requires at least: 5.8
 * Requires PHP: 8.0
 * License: MIT
 * Text Domain: wp-contact-form
 * 
 * @package wp-contact-form
 */

// Exit if accessed directly.
if (! defined('ABSPATH')) {
    exit;
}

// Adds shortcode for the form.
// [wp_contact_form] add this to editor to render the form wherever you like.
add_shortcode('wp_contact_form', 'wp_learn_contact_form');
/**
 * Shortcode for the form.
 *
 * @return void
 * @since  1.0.0
 */
function wp_learn_contact_form()
{
    ob_start();
?>
    <div class="wp-contact-form">
        <form method="post" action="">
            <label for="first_name">First Name</label>
            <input type="text" id="first_name" name="first_name" required>

            <label for="last_name">Last Name</label>
            <input type="text" id="last_name" name="last_name" required>

            <label for="subject">Subject</label>
            <input type="text" id="subject" name="subject" required>

            <label for="email">Email</label>
            <input type="email" id="email" name="email" required>

            <label for="message">Message</label>
            <textarea id="message" name="message" required></textarea>

            <input type="submit" name="submit" value="Submit">

        </form>

    </div>

<?php
    return ob_get_clean();
}

// Enqueue scripts and styles.
add_action('wp_enqueue_scripts', 'wp_learn_enqueue_form_styles');
function wp_learn_enqueue_form_styles(){
    wp_enqueue_style('wp-contact-form', plugin_dir_url(__FILE__) . '/css/style.css', array(), '1.0.0', 'all');
}


add_action('wp', 'wp_learn_handle_submission');
function wp_learn_handle_submission(){
    if( isset( $_POST['submit'] ) ) {
        // Sanitize the data.
        $first_name = isset( $_POST['first_name'] ) ? sanitize_text_field( $_POST['first_name'] ) : '';
        $email = isset( $_POST['email'] ) ? sanitize_email( $_POST['email'] ) : '';
        $message = isset( $_POST['message'] ) ? sanitize_textarea_field( $_POST['message'] ) : '';
        add_action('the_content', 'wp_learn_render_data');
    }
}

function wp_learn_render_data( $content ){
    $message = '<p>Thank you for contacting us. We will get back to you shortly.</p>';
    return $content . $message;
}