For properties just read and never written, use the keyword const.
If you are defining a property that is never going to be written, you can use the const keyword.
const is a way of defining a constant value. Constants are useful when we want to define values that don't change within the codebase, so they can be used across it. Because readonly properties only get assigned at the point of definition, you only need to set them once.
For properties that are write only, use the keyword mutable.
In Swift, you can use the keyword mutable to make a property read-only. Mutable properties are only writable inside of your class, and they cannot be accessed outside of that class; but because they’re not written by other classes, you don’t need to worry about other classes modifying them.
For a property that is read and written, but is not visible outside the class, mark it as private.
To assign a value to a property that is read and written, but not visible outside the class, mark it as private. This means that the property can be accessed only by methods within the class and cannot be accessed through inheritance or an interface.
Private properties are useful for encapsulation because they allow you to hide data from consumers of your class in such a way that they do not need to know anything about how it works.
Properties can be complex to code but they are very helpful.
Properties are a feature of the Object Oriented Programming (OOP) paradigm in which data and methods are encapsulated into objects that can be managed and manipulated independently of other objects.
In PHP, a property is just another way to refer to a variable. It's not technically an object or variable; it's a way of accessing the underlying variable. Let's go over how we can make our own properties using some simple examples:
```php
class Person {
First Name = ""
Last Name = ""
}
```
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