Report PHP OOM errors in Bugsnag

OomSnag.php

<?php

namespace Foobar\Bugsnag;

use Bugsnag\Client;

class OomSnag
{
    private const REGEX = '/^Allowed memory size of ([0-9]+) bytes exhausted/';

    /**
     * @var Client
     */
    private $bugsnag;

    public function __construct(Client $bugsnag)
    {
        $this->bugsnag = $bugsnag;
    }

    public function register()
    {
        // Make sure we can call ini_set for free
        ini_set('bugsnag.dummy_call', 0);

        register_shutdown_function(function () {
            $error = error_get_last();

            if ($error && $error['type'] === 1 && preg_match(self::REGEX, $error['message'], $matches)) {
                // Allow Bugsnag some extra memory
                ini_set('memory_limit', (int)$matches[1] + 10000000);

                $this->bugsnag->notifyError('memory_limit', $error['message'], function ($report) use ($error) {
                    $report->setPHPError($error['type'], $error['message'], $error['file'], $error['line'], true);
                });
            }
        });
    }
}