Pretty-print an array of objects

format.php

<?php

function format(array $data, string $type): string
{
    $data = array_map(function ($obj) {
        return array_map(function ($value) {
            if ($value === null) {
                return 'null';
            }
            if ($value === true) {
                return 'true';
            }
            if ($value === false) {
                return 'false';
            }
            return $value;
        }, get_object_vars($obj));
    }, array_slice($data, 0, 2));

    $formatted = print_r($data, true);
    return preg_replace('/\[([0-9]+)\] => Array/', "[$1] => {$type} Object", $formatted);
}