How to log all php errors into day by day separated folders?

Add this to your public/index.php, first remove the try/catch:

set_exception_handler(function($e) {

    $directory = '../app/logs/' . date('Ym');
    if (!is_dir($directory)) {
        mkdir($directory, 0777, true);
    }

    file_put_contents($directory . '/error-log' . date('d') . '.txt' ,
        $e->getMessage() . PHP_EOL .
        print_r($e->getTrace(), true) . PHP_EOL .
        print_r($_POST, true)         . PHP_EOL .
        print_r($_GET, true)          . PHP_EOL .
        print_r($_SERVER, true),
    FILE_APPEND);

});