PHP: trait example

index.php

<?php
trait Trait1
{
    public function a()
    {
        echo 'a1';
    }
}

trait Trait2
{
    public function a()
    {
        echo 'a2';
    }
}

class Class1
{
    use Trait1, Trait2 {
        Trait2::a insteadof Trait1;
    }
}

$c = new Class1();
$c->a();