PHP 5: const vs static

Question

In PHP 5, what is the difference between using const and static?

When is each appropriate? And what role does public, pr

Answer 1

So to recap on @Matt great answer:

• if the property you need should not be changed, then a constant is the the proper choice

• if the property you need is allowed to be changed, use static instead

Example:

class User{
    private static $PASSWORD_SALT = "ASD!@~#asd1";
    ...
}

class Product{
    const INTEREST = 0.10;
    ...
}

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Edit: It is important to note that PHP 7.1.0 introduced support for specifying the visibility of class constants.