BuddyPress member types : display the type near each user in the members loop (requires BuddyPress 2.2)

bp-custom.php

<?php
/**
 * Using BuddyPress Member types API
 *
 * see codex: https://codex.buddypress.org/developer/member-types/
 * 
 * Required config:
 * - WordPress 4.1
 * - BuddyPress 2.2
 * 
 * License: GNU/GPL 2
 * Author: imath
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Register member types.
 *
 * From the wp-admin/extended profile
 * it will be possible to set the user's member type
 */
function using_mt_register_member_types() {
	bp_register_member_type( 'student', array(
		'labels' => array(
			'name'          => __( 'Students', 'using-mt' ),
			'singular_name' => __( 'Student', 'using-mt' ),
		),
	) );

	bp_register_member_type( 'teacher', array(
		'labels' => array(
			'name'          => __( 'Teachers', 'using-mt' ),
			'singular_name' => __( 'Teacher', 'using-mt' ),
		),
	) );
}
add_action( 'bp_init', 'using_mt_register_member_types' );

/**
 * Get the singular name out of of member type's name or array of names
 */ 
function using_mt_get_member_type_singular_name( $name = '' ) {
	if ( empty( $name ) ) {
		return false;
	}

	$output = '';

	if ( is_array( $name ) ) {
		$member_types_objects = bp_get_member_types( array(), 'objects' );

		$output_array = array();
		foreach ( $name as $name_type ) {
			if ( empty( $member_types_objects[ $name_type ]->labels['singular_name'] ) ) {
				continue;
			}

			$output_array[] = $member_types_objects[ $name_type ]->labels['singular_name'];
		}

		$output = join( ', ', $output_array );
	} else {
		$member_type_object = bp_get_member_type_object( $name );
	
		if ( ! empty( $member_type_object->labels['singular_name'] ) )  {
			$output = $member_type_object->labels['singular_name'];
		}
	}

	return $output;
}

/**
 * Display in loop
 * 
 * If a member has more than one member types, they will be comma separated
 */ 
function using_mt_in_members_loop() {
	$member_type = bp_get_member_type( bp_get_member_user_id(), false );
	echo esc_html( using_mt_get_member_type_singular_name( $member_type ) );
}
add_action( 'bp_directory_members_item', 'using_mt_in_members_loop' );