Index Plugin Form

// Our callback to create the contact form page.
function gym_contact_create_form() {
  $form = array(
    'post_title'    => wp_strip_all_tags( 'Gym Contact Page' ),
    'post_name'    => 'gym-contact-form',
    'post_status'   => 'publish',
    'post_author'   => 1,
    'post_type'     => 'page',
  );
  // Check if page exists
  $page = get_page_by_path('gym-contact-form');
  if ($page == NULL) {
    // Create a page upon creation.
    wp_insert_post( $form );
  }
}

// Mock data
function gym_contact_install_data() {
  global $wpdb;
  $table_name = $wpdb->prefix . 'contact';

  $test_name = 'Michael Williams';
  $test_email = 'mikew@monarchdigital.com';
  $test_phone = '(719)344-2118';
  $test_message = 'This is my test message. My heater needs repair.';

    $wpdb->insert(
        $table_name,
        array(
            'name' => $test_name,
            'email' => $test_email,
            'phone' => $test_phone,
            'message' => $test_message,
            'time' => current_time( 'mysql' )
        )
    );
}

// Hook up our template file for the contact form - https://codex.wordpress.org/Plugin_API/Filter_Reference/page_template
add_filter( 'page_template', 'gym_contact_form_template' );
function gym_contact_form_template( $page_template ) {
  if ( is_page( 'Gym Contact Page' ) ) {
    $page_template = dirname( __FILE__ ) . '/includes/gym_contact_form.php';
  }
  return $page_template;
}