opensourcepos/app/Events/Db_log.php

<?php

namespace App\Events;

use Config\Database;

class Db_log
{
	public function db_log_queries(): void
	{
		$config = config('App');
		// check if database logging is enabled (see config/config.php)
		if($config->db_log_enabled)
		{
			$filepath = WRITEPATH . 'logs/Query-log-' . date('Y-m-d') . '.log';
			$handle = fopen($filepath, "a+");
			$message = $this->generate_message($config);

			if(strlen($message) > 0)
			{
				fwrite($handle, $message . "\n\n");
			}

			// Close the file
			fclose($handle);
		}
	}

	private function generate_message($config): string
	{
		$db = Database::connect();
		$last_query = $db->getLastQuery();
		$affected_rows = $db->affectedRows();
		$execution_time = $this->convert_time($last_query->getDuration());

		$message = $last_query->getQuery()
			. " \n Affected rows: $affected_rows"
			. " \n Execution Time: " . $execution_time['time'] . ' ' . $execution_time['unit'];

		$long_query = ($execution_time['unit'] === 's') && ($execution_time['time'] > 0.5);
		if($long_query)
		{
			$message .= ' [LONG RUNNING QUERY]';
		}

		return $config->db_log_only_long && !$long_query ? '' : $message;
	}

	private function convert_time(float $time): array
	{
		$unit = 's';

		if($time <= 0.1 && $time > 0.0001)
		{
			$time = $time * 1000;
			$unit = 'ms';
		}
		elseif($time <= 0.0001)
		{
			$time = $time * 1000000;
			$unit = 'µs';
		}

		return ['time' => $time, 'unit' => $unit];
	}
}