Impara What Models Represent

In MVC, models represent your application's data and business logic. A model is more than just storage, it is the main interface for working with databases, APIs, or other sources, and it controls how data is structured, validated, and updated.

By keeping this logic inside the model, you maintain a clear separation of concerns. This keeps data handling separate from the interface and controllers, making the code easier to maintain and extend.

user.php


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<?php

class User
{
    public $id;
    public $name;
    public $email;
}

In this simple User model, you see three properties: id, name, and email, which represent typical user data in an application. Grouping them in a class gives your user data a clear structure.

Models also include methods that handle tasks like saving, updating, or applying business rules. The properties store the data, while the methods define what can be done with it.

product.php


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<?php

class Product
{
    public $name;
    public $price;

    public function isValid()
    {
        return !empty($this->name) && $this->price > 0;
    }

    public function getFormattedPrice()
    {
        return "$" . number_format($this->price, 2);
    }
}

The Product model shows how you can include validation and computed values directly in a model. The isValid() method checks that the product has a name and a positive price, while getFormattedPrice() returns the price in a display-friendly format. Keeping this logic inside the model makes the code easier to maintain and reuse.

Note

By handling validation and formatting in the model, controllers and views do not need to know the internal rules of the data. This results in cleaner, more modular, and better organized applications.

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Sezione 4. Capitolo 1

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Suggested prompts:

Can you explain more about how models interact with controllers in MVC?

What are some best practices for organizing model logic?

Can you give examples of common methods found in models?

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