Paid Memberships Pro Register Helper field type examples shows an example of every possible field in Register Helper

pmpro-register-helper-fields-examples.php

<?php
/**
 * This example is to show you the 'niche' options each Paid Memberships Pro - Register Helper Add-on field can take and how to use it.
 *
 * Add this to a Customizations Plugin and customize to suit your needs
 */

function initialize_pmprorh_fields() {
	// don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}
	// define the fields
	$fields = array();

	// TEXT FIELD
	$fields[] = new PMProRH_Field(
		'text_example',             // input name, will also be used as meta key
		'text',                    // type of field
		array(
			'size' => 20,        // size attribute of text field
		)
	);

	// TEXTAREA
	$fields[] = new PMProRH_Field(
		'textarea_example',             // input name, will also be used as meta key
		'textarea',                    // type of field
		array(
			'rows' => 10,        // row attribute of textarea (height)
			'cols' => 50,       // cols attribute of textarea (width)
		)
	);
	
	// SELECT
	$fields[] = new PMProRH_Field(
		'select_example',             // input name, will also be used as meta key
		'select',                    // type of field
		array(
			'options' => array(
				'' => '',    // blank option to be displayed first, followed by options
				'option_1' => 'Option 1',
				'option_2' => 'Option 2',
				'option_3' => 'Option 3',
			),
		)
	);


	// MULTISELECT
	$fields[] = new PMProRH_Field(
		'select_example',             // input name, will also be used as meta key
		'select',                    // type of field
		array(
			'multiple' => true, // allow multiple selections for select
			'options' => array(
				'' => '',    // blank option to be displayed first, followed by options
				'option_1' => 'Option 1',
				'option_2' => 'Option 2',
				'option_3' => 'Option 3',
			),
		)
	);

	// SELECT2
	$fields[] = new PMProRH_Field(
		'select_2_example',             // input name, will also be used as meta key
		'select2',                    // type of field
		array(
			'options' => array(
				'' => '',    // blank option to be displayed first, followed by options
				'option_1' => 'Option 1',
				'option_2' => 'Option 2',
				'option_3' => 'Option 3',
			),
		)
	);

	// CHECKBOX
	$fields[] = new PMProRH_Field(
		'checkbox_example',             // input name, will also be used as meta key
		'checkbox',                    // type of field
		array(
			'text' => 'Check this', // string for <label></label>
		)
	);

	// RADIO
	$fields[] = new PMProRH_Field(
		'radio_example',             // input name, will also be used as meta key
		'radio',                    // type of field
		array(
			'options' => array(      // display the different options, no need for a "blank" option
				'option_1' => 'Option 1',
				'option_2' => 'Option 2',
				'option_3' => 'Option 3',
			),
		)
	);

	// FILE
	$fields[] = new PMProRH_Field(
		'file_example',             // input name, will also be used as meta key
		'file',                    // type of field
		array(
			'accept' => 'image/*',   // accept all image types for file upload  (http://www.w3schools.com/TAGs/att_input_accept.asp)
		)
	);

	// HTML
	$fields[] = new PMProRH_Field(
		'html_example',             // input name, will also be used as meta key
		'html',                    // type of field
		array(
			'html' => '<p><u>Add a paragraph into your checkout.php for Paid Memberships Pro. You may also use normal HTML code to generate fields.</u></p>',   // accepts HTML code
		)
	);

	// HTML
	$fields[] = new PMProRH_Field(
		'hidden_example',             // input name, will also be used as meta key
		'hidden'                   // type of field - creates a field that is hidden. (Great for creating a honeypot for your checkout form)
	);

	/**
	*   Conditional field example. Display a textfield depending on checkbox value
	*/

	$fields[] = new PMProRH_Field(
		'conditional_example_depends_on',             // input name, will also be used as meta key
		'checkbox',                    // type of field
		array(
			'text' => 'Check this to display a text field', // string for <label></label>
		)
	);

	$fields[] = new PMProRH_Field(
		'conditional_example_show',             // input name, will also be used as meta key
		'text',                    // type of field
		array(
			'depends' => array(
				array(
					'id' => 'conditional_example_depends_on', // depends on this field
					'value' => true, // if checkbox is checked show this field
				),
			),
		)
	);

	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes', // location on checkout page
			$field            // PMProRH_Field object
		);
	}
	// that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'initialize_pmprorh_fields' );