how to get used traits in php-class?

Question

Is there any function in PHP (5.4) to get used traits as array or similar:

class myClass extends movingThings {   use bikes, tanks;    __construct() {     echo 'I\'m using the two traits:' . ????; // bikes, tanks   } } 

Answer 1

To easily get the used traits you can call class_uses()

$usedTraits = class_uses(MyClass); // or $usedTraits = class_uses($myObject); 

General recommendations

When checking for available functionality, I would generally recommend to use interfaces. To add default functionality to an interface you would use traits. This way you can also benefit from type hinting.

Force an object having functionality by implementing an interface and then use a trait to implement default code for that interface.

class MyClass      implements SomeInterface  {     use SomeTrait; } 

Then you can check the interface by;

$myObject = new MyClass(); if ($myObject instanceof SomeInterface) {     //... } 

And still use type hinting;

function someFunction( SomeInterface $object ) {      //... } 

Answer 2

You can write it yourself, by using the ReflectionClass

$rc = new ReflectionClass('myClass'); $count = count($rc->getTraits());