Show timeslot note in the dropdown

functions.php

<?php

/**
 * This function will add the note information to its respective timeslots.
 *
 * @param array $time_drop_down_array Array of timeslots and its lockout. Key will be timeslot and it contains array with has lockout information.
 * @param array $extra_information Additional Informations.
 * @since 1.0
 */
function bkap_time_slot_filter( $time_drop_down_array, $extra_information ) {

	$product_id                = $_POST['post_id'];
	$current_date              = sanitize_text_field( $_POST['current_date'] );
	$booking_date              = date( 'j-n-Y', strtotime( $current_date ) );
	$booking_times             = get_post_meta( $product_id, '_bkap_time_settings', true );
	$time_format_to_show       = $extra_information['time_format_to_show'];
	$time_drop_down_array_note = array();

	foreach ( $time_drop_down_array as $key => $value ) {
		$note                                 = bkap_get_timeslot_data( $product_id, $booking_date, $value, 'booking_notes', $booking_times );
		$time_drop_down_array_note[ $value ] = $note;
	}

	return $time_drop_down_array_note;
}
add_filter( 'bkap_time_slot_filter_after_chronological', 'bkap_time_slot_filter', 10, 2 );

function bkap_get_timeslot_data( $product_id, $date, $time, $data = 'booking_notes', $time_settings = array(), $passed_data = 'time' ) {

	$information = '';
	$slots_list  = array();
	$time_format = bkap_common::bkap_get_time_format();
	if ( empty( $time_settings ) ) {
		$time_settings = get_post_meta( $product_id, '_bkap_time_settings', true );
	}

	if ( isset( $time_settings[ $date ] ) ) {
		$slots_list = $time_settings[ $date ];
	} else {
		// check for the weekday.
		$weekday         = date( 'w', strtotime( $date ) );
		$booking_weekday = "booking_weekday_$weekday";

		if ( is_array( $time_settings ) && count( $time_settings ) > 0 && array_key_exists( $booking_weekday, $time_settings ) ) {
			$slots_list = $time_settings[ $booking_weekday ];
		}
	}

	foreach ( $slots_list as $times ) {

		$from_time_check = date( $time_format, strtotime( $times['from_slot_hrs'] . ':' . $times['from_slot_min'] ) );
		$to_time_check   = date( $time_format, strtotime( $times['to_slot_hrs'] . ':' . $times['to_slot_min'] ) );

		if ( '' !== $to_time_check && '00:00' !== $to_time_check && '12:00 AM' !== $to_time_check ) {
			$time_check = "$from_time_check - $to_time_check";
		} else {
			$time_check = "$from_time_check";
		}

		switch ( $passed_data ) {
			case 'time':
				if ( $time_check === $time ) {
					$information = $times[ $data ];
					if ( '' === $information ) {
						$information = $time;
					}
				}
				break;
			case 'booking_notes':
				$note = $times['booking_notes'];
				if ( $note != '' ) {
					if ( $note === $time ) {
						$information = $time_check;
					}
				} else {
					$information = $time;
				}
				break;
		}		
	}

	return $information;
}