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<?php class FooNotUsingBarTrait { } if (trait_exists(BarTrait::class)) { class Foo extends FooUsingBarTrait { } } else { class Foo extends FooNotUsingBarTrait { } } $foo = new Foo(); var_dump( get_class($foo), class_parents(Foo::class) );
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
string(3) "Foo" array(1) { ["FooNotUsingBarTrait"]=> string(19) "FooNotUsingBarTrait" }

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