PHP Traits
PHP only supports single inheritance: a child class can inherit only from one single parent. So, what if a class needs to inherit multiple behaviors? Traits solve this problem.
Traits are a mechanism for code reuse in single inheritance languages such as PHP. A Trait is intended to reduce some limitations of single inheritance by enabling a developer to reuse sets of methods freely in several independent classes living in different class hierarchies.
1. Defining a Trait
Traits are declared with the trait keyword.
trait message1 {
public function msg1() {
echo "OOP is fun! ";
}
}2. Using a Trait
To use a trait in a class, use the use keyword.
class Welcome {
use message1;
}
$obj = new Welcome();
$obj->msg1();3. Multiple Traits
A class can use multiple traits, separated by commas.
trait message2 {
public function msg2() {
echo "OOP reduces code duplication!";
}
}
class Welcome2 {
use message1, message2;
}