<?php
declare(strict_types=1);

final class Report
{
    public function __construct(public string $title) {}
}

$initializations = 0;
$reflection = new ReflectionClass(Report::class);
$report = $reflection->newLazyGhost(
    static function (Report $report) use (&$initializations): void {
        ++$initializations;
        $report->__construct('Monthly summary');
    }
);
echo $initializations, PHP_EOL; // 0
echo $report->title, PHP_EOL;   // Monthly summary
echo $report->title, PHP_EOL;   // Monthly summary
echo $initializations, PHP_EOL; // 1