1.php

<?php
private function getArrayRequest(string $token, array $data, bool $ios = false): array
    {
        if ($ios) $this->getIosArrayRequest($token, $data);
        return $this->getAndroidArrayRequest($token, $data);
    }

    private function getIosArrayRequest(string $token, array $data)
    {
        return [
            'notification' => [
                'title' => 'title',
                'sound' => 'default',
                'body' => 'body',
            ],
            'mutable_content' => true,
            'to' => $token,
            'data' => $data,
        ];
    }

    private function getAndroidArrayRequest(string $token, array $data)
    {
        return [
            'to' => $token,
            'data' => $data,
        ];
    }