[5.3] Allow array of strings/arrays, optional name attr

[misog]

This works in 5.3:
Mail::to('name1@example.com')->send(new OrderShipped($order));

And this works too:
$user1 = User::find(1);
$user2 = User::find(2);
Mail::to([$user1, $user2])->send(new OrderShipped($order));

However this does not work in 5.3:
Mail::to(['name1@example.com','name2@example.com'])->send(new
OrderShipped($order));

And this does not work in 5.3 too:
$user1 = User::find(1)->toArray();
$user2 = User::find(2)->toArray();
Mail::to([$user1, $user2])->send(new OrderShipped($order));

This commmit implements all cases plus it allows to not to have 'name'
attribute in User model (User models often have first_name and
last_name).

[misog]

Well, it does not work with multiple addresses - even if protected $to array in Mailable.php file contains multiple addresses, only one email is sent.

[garygreen]

It already supports an array of addresses or collection. Also I don't think it should support [$user1->toArray(), $user2->toArray()] that's just getting silly.

[misog]

@garygreen no, it does not currently support array of string addresses (it just crashes).
And this is not silly:

Mail::to([
    [
        'email' => 'user1@example.com',
        'name' => 'User Doe',
    ],
    [
        'email' => 'user2@example.com',
        'name' => 'User Foe',
    ],
])->send(new OrderShipped($order));

However there is some bug somewhere deeper which prevents from sending multiple emails.

[taylorotwell]

Sending to multiple emails definitely works in current Laravel. I just did it.

[misog]

This works (mailtrap.io has received):
Mail::to('test@example.com')->send(new App\Mail\OrderCreated(App\Order::first()));
=> null

This crashes:
Mail::to(['test@example.com','test2@example.com'])->send(new App\Mail\OrderCreated(App\Order::first()));

PHP error: Trying to get property of non-object in D:\xampp\htdocs\project\vendor\laravel\framework\src\Illuminate\Mail\Mailable.php on line 377
https://github.com/laravel/framework/blob/5.3/src/Illuminate/Mail/Mailable.php#L377