trainer-contact.php

<?php
/**
 * Core Functionality Plugin
 * 
 * @package    CoreFunctionality
 * @since      1.0.0
 * @copyright  Copyright (c) 2014, Bill Erickson & Jared Atchison
 * @license    GPL-2.0+
 */

// Trainer Form
define( 'EA_TRAINER_FORM_ID', 160 );

// Hidden field we're using for trainer ID
// In WPForms, set default value to {query_var key="trainer"}
define( 'EA_TRAINER_FIELD_ID', 4 );

/**
 * Adds trainer photo and name at top of form
 * @author Bill Erickson
 * @link http://www.billerickson.net/contact-form-dynamic-notification/
 * 
 * @param array $form_data, form data
 */
function ea_trainer_on_form( $form_data ) {

	// Only run on the 'Contact a Trainer' form, and if a trainer is specified in the URL
	if( !( EA_TRAINER_FORM_ID == $form_data['id'] && isset( $_GET['trainer'] ) ) )
		return;
	
	// Display trainer	
	$trainer = intval( $_GET['trainer'] );
	$name = get_the_title( $trainer );
	$photo = get_the_post_thumbnail( $trainer, 'thumbnail', array( 'class' => 'alignleft' ) );
	echo '<h2 class="trainer">' . $photo . $name . '</h2>';
	
}
add_action( 'wpforms_frontend_output', 'ea_trainer_on_form', 9 );

/**
 * Use trainer email address 
 * @author Bill Erickson
 * @link http://www.billerickson.net/contact-form-dynamic-notification/
 * 
 * @param array $email, contains all the information used to build email notification (address, message...)
 * @param array $fields, form fields
 * @param array $entry, form entry
 * @param array $form_data, form data
 * @return array $email
 */
function ea_trainer_email_address( $email, $fields, $entry, $form_data ) {

	if( !( EA_TRAINER_FORM_ID == $form_data['id'] ) )
		return $email;
	
	$trainer = false;
	foreach( $fields as $field) {
		if( EA_TRAINER_FIELD_ID == $field['id'] ) {
			$trainer = intval( $field['value'] );
		}
	}
	
	if( ! $trainer )
		return $email;
		
	$trainer_email = is_email( get_post_meta( $trainer, 'ea_trainer_email', true ) );
	if( !empty( $trainer_email ) )
		$email['address'] = array( $trainer_email );
	
	return $email;
}
add_filter( 'wpforms_entry_email_atts', 'ea_trainer_email_address', 10, 4 );