trait-confilct.php

<?php

class Base
{
    private $called = false;
    public function save()
    {
        if ($this->called) {
            throw new Exception("should be only called once!", 1);
        }
        $this->called = true;
    }
}

trait TraitA
{
    public function save()
    {
        parent::save();
    }
}

trait TraitB
{
    public function save()
    {
        parent::save();
    }
}

class ExtA extends Base
{
    use TraitA;
}

class ExtB extends Base
{
    use TraitB;
}

class ExtC extends Base
{
    use TraitA, TraitB {
        TraitA::save as saveA;
        TraitB::save as saveB;
    }

    function save()
    {
        $this->saveA();
        $this->saveB();
    }
}

$a = new ExtA;
$a->save();

$b = new ExtB;
$b->save();

$c = new ExtC;
$c->save();