Example of one RH field depending on another.

pmpro_register_helper_depends_field_example.php

<?php
// This code should be placed into context of adding RH fields
// like this: https://www.paidmembershipspro.com/documentation/register-helper-documentation/code-examples/

//define the fields
$fields = array();
$fields[] = new PMProRH_Field(
	'budget',						// input name, will also be used as meta key
	'select',						// type of field
	array(
		'options' => array(				// <option> elements for select field
			''		=> '',			// blank option - cannot be selected if this field is required
			'lessthan2000'	=> '&lt; $2,000',	// <option value="lessthan2000">&lt; $2,000</option>
			'2000to5000'	=> '$2,000-$5,000',	// <option value="2000to5000">$2,000-$5,000</option>
			'5000to10000'	=> '$5,000-$10,000',	// <option value="5000to10000">$5,000-$10,000</option>
			'morethan10000'	=> '&gt; $10,000',	// <option value="morethan10000">&gt; $10,000</option>
		)
	)
);

$fields[] = new PMProRH_Field(
	'RFP',
	'file',
	array(
		'label' => 'Upload your RPF',
		'hint' => 'This will only show for budgets above 5000.',
		'depends' => array( array( 'id' => 'budget', 'value' => array('5000to10000', 'morethan10000') ) ),
	)
);