Filter BuddyPress Multi select value to add extra markup

buddypress-filter-multi-select-profile-field-value.php

/**
 * Filter BuddyPress multi select value and add spans around for custom styling.
 *
 * @see https://buddydev.com/support/forums/topic/add-extra-css-on-a-profile-field/
 */
add_filter( 'bp_get_the_profile_field_value', function ( $value ) {
	global $field;
	if ( empty( $field ) || 'multiselectbox' !== $field->type ) {
		return $value;
	}

	return join(
		',',
		array_map(
			function ( $val ) {
				return "<span class='m-select-entry'>" . $val . '</span>';
			},
			explode( ',', $value )
		)
	);
}, 9 );