Laravel5.1 validation rule alpha is invalid for Chinese?

laravel5.1 alphawritten in the documentation

Verify that the field value contains only alphabetic characters.

But when I input Chinese, no error was reported. Could it be that laravel’s default Chinese characters are also letters?

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laravel5.1

alphawritten in the documentation

Verify that the field value contains only alphabetic characters.

But when I input Chinese, no error was reported. Could it be that laravel’s default Chinese characters are also letters?