$email = isset($blog->user->email) ? $blog->user->email : 'no email';
// blog模板中
{{ $blog->user->email or 'no email' }}
$email = $blog->user->email ?? 'no email';
$email = object_get($blog->user, 'email', 'no email');
$email = data_get($blog->user, 'email', 'no email');
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