PHP Traits conflict (trait param)

Question

I have three traits.

Trait Param, GroupId and SessionId. Traits GroupId and SessionId include Param.

Class GroupSession include traits GroupId and SessionId

<?php

trait Param
{
    private $params = [];

    public function setParams($params)
    {
        $this->params = $params;
    }

    public function getParam($param)
    {
        return isset($this->params[$param])
            ? $this->params[$param]
            : null;
    }
}

trait GroupId
{
    use Param;

    public function getGroupId()
    {
        return $this->getParam('group.id');
    }
}

trait SessionId
{
    use Param;

    public function getSessionId()
    {
        return $this->getParam('session.id');
    }
}

class GroupSession
{
    use GroupId {
        GroupId::setParams insteadOf SessionId;
        GroupId::getParam insteadOf SessionId;
    }
    use SessionId;
}

$t = new GroupSession();

When I try to run this code I get an error:

GroupId and SessionId define the same property ($params) in the composition of GroupSession. However, the definition differs and is considered incompatible.

Tell me, please, how to resolve this problem?

Thank you!

Would be easier if GroupSession imported Param instead of GroupId/SessionId doing so. The latter two traits just expect the importing class to provide a getParam/setParam method. Since GroupSession in your implementation has to take care of/modify the traits anyway, I don't think that's a disadvantage. — VolkerK
– VolkerK, Commented Dec 1, 2015 at 8:36
@VolkerK, thank you! Now my problem is solved by this way. But I think, that is not native method. Why? Because our traits needs to implemetation some methods in classes, that include its. — J Sorel
– J Sorel, Commented Dec 2, 2015 at 10:30

Oliver Nybo · Accepted Answer · 2019-05-01 08:51:49Z

2

Resolves to method naming conflict

trait A
{
    public function smallTalk()
    {
        echo "I am form trait A and method smallTalk";
        echo "<br>";
    }

    public function bigTalk()
    {
        echo "I am form trait A and method bigTalk";
        echo "<br>";
    }
}


trait B
{
    public function smallTalk()
    {
        echo "I am form trait B and method smallTalk";
        echo "<br>";
    }

    public function bigTalk()
    {
        echo "I am form trait B and method bigTalk";
        echo "<br>";
    }
}

class AB
{
    use A, B {
    A::bigTalk insteadof B;
    B::bigTalk as gazi;
    B::smallTalk insteadof A;
    A::smallTalk as anis;
    }
}

$obj1 = new AB;
$obj1->bigTalk();
$obj1->gazi();
$obj1->smallTalk();
$obj1->anis();

edited May 1, 2019 at 8:51

Oliver Nybo

5601 gold badge8 silver badges25 bronze badges

answered Mar 12, 2019 at 8:36

GaziAnis

496 bronze badges

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