src/Viserio/Component/Mail/Mailer.php
protected function parseView($view): array
    {
        if (\is_string($view)) {
            return [$view, null, null];
        }

        // If the given view is an array with numeric keys, we will just assume that
        // both a "pretty" and "plain" view were provided, so we will return this
        // array as is, since must should contain both views with numeric keys.
        if (\is_array($view) && isset($view[0])) {
            return [$view[0], $view[1], null];
        }

        // If the view is an array, but doesn't contain numeric keys, we will assume
        // the the views are being explicitly specified and will extract them via
        // named keys instead, allowing the developers to use one or the other.
        if (\is_array($view)) {
            return [
                $view['html'] ?? null,
                $view['text'] ?? null,
                $view['raw'] ?? null,
            ];
        }

        throw new UnexpectedValueException('Invalid view.');
    }
protected function parseView($view): array
    {
        if (\is_string($view)) {
            return [$view, null, null];
        }

        // If the given view is an array with numeric keys, we will just assume that
        // both a "pretty" and "plain" view were provided, so we will return this
        // array as is, since must should contain both views with numeric keys.
        if (\is_array($view) && isset($view[0])) {
            return [$view[0], $view[1], null];
        }

        // If the view is an array, but doesn't contain numeric keys, we will assume
        // the the views are being explicitly specified and will extract them via
        // named keys instead, allowing the developers to use one or the other.
        if (\is_array($view)) {
            return [
                $view['html'] ?? null,
                $view['text'] ?? null,
                $view['raw'] ?? null,
            ];
        }

        throw new UnexpectedValueException('Invalid view.');
    }
Parse the given view name or array.

@param array|string $view

@throws \Viserio\Component\Contract\Mail\Exception\UnexpectedValueException

@return array