WpdbLogger.php

<?php
declare(strict_types=1);

namespace WPDesk\Migrations;

use Psr\Log\LoggerTrait;

class WpdbLogger implements \Psr\Log\LoggerInterface {
	use LoggerTrait;

	private const MAX_LOG_SIZE = 30;

	/** @var string[] */
	private $log = [];

	/** @var string */
	private $log_name;

	public function __construct( string $log_name ) {
		$this->log_name = $log_name;
	}

	public function log( $level, $message, array $context = [] ) {
		if ( empty( $this->log ) ) {
			$this->log = json_decode(
				get_option(
					$this->log_name,
					'[]'
				)
			);
		}

		$this->log[] = date( 'Y-m-d G:i:s' ) . sprintf( ': %s', $message );
		if ( \count( $this->log ) > self::MAX_LOG_SIZE ) {
			array_shift( $this->log );
		}

		update_option( $this->log_name, json_encode( $this->log ), false );
	}
}