Gravity Perks // GF Populate Anything // Only Show Unique Choices

gp-populate-anything-unique-choices.php

<?php
/**
 * Gravity Perks // GF Populate Anything // Only Show Unique Choices
 * http://gravitywiz.com/documentation/gravity-forms-populate-anything/
 */
add_filter( 'gppa_input_choices', function( $choices ) {
	global $gppa_uniques;
	$gppa_uniques = array();
	$choices = array_filter( $choices, function( $var ) {
		global $gppa_uniques;
		if( ! in_array( $var['value'], $gppa_uniques ) ) {
			$gppa_uniques[] = $var['value'];
			return true;
		}
		return false;
	} );
	return $choices;
} );