Скачать или смотреть Traits in PHP: What they are and how to use them

PHP supports single inheritance only. It means one child class can inherits from one parent class only.

What will happen if we want to inherit features of two or more classes? Answer is we have to use trait for multiple inheritance.

Trait can be created using keyword "trait". Again, to implement trait in a class, keyword "use" is utilized.

All the three access specifiers public, protected, and private can be used in the functions declared in a trait.

Let's see an example.
We have created a trait Eagle and it has a function speed(). Our class Animal use this trait. Now, we can access the functions of trait Eagle by class Animal's objects.
trait Eagle
{
public function speed()
{
echo "Fly with great speed.";
}
}
class Animal
{
use Eagle;
}
$animal = new Animal();
$animal-gt;speed();

Let's see how can we inherit multiple features into a single class.
We have created another trait called Dolphin that has a function intelligent(). Now, we are using both traits Eagle and Dolphin in our class Animal. Hence, we can use all the functions available in these two traits by Animal's objects.
trait Eagle
{
public function speed()
{
echo "Fly with great speed.";
}
}
trait Dolphin
{
public function intelligent()
{
echo "The most intelligent.";
}
}
class Animal
{
use Eagle, Dolphin;
}
$animal = new Animal();
$animal-gt;speed();
$animal-gt;intelligent();