May I ask you a few questions about thinkphp development?

Ask the following questions about the development of thinkphp
Small just contact MVC development model, with thinkphp development, the user submitted the form, the verification of the form on the C-level or in the M layer ah?
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Thinkphp built-in model verification

If you feel inconvenient, you can accept the parameter in C for manual verification.
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Encapsulation in the M-layer is better, before the storage of required fields and data legality are checked once
For example, the user name password must be filled and the number of digits greater than 6, mobile phone and mailbox format, etc.
The operation returns true successfully, the failure returns the error string, and then the C-layer $this->error () directly prints the error, or the Ajax returns, depending on the situation
The interface of M layer can be called by multiple pages of C layer

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