<?php trait BarTrait { } class FooUsingBarTrait { use BarTrait; } 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) );
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