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run code in 300+ PHP versions simultaneously
<?php trait A { abstract function foo(); } trait B { abstract function foo(): stdclass; } class C { use A; use B; function foo(): stdClass{ // valid for both A (mixed) and B (stdClass) return new stdClass; } } $x = new C(); var_dump($x->foo());

This is an error 500

Value for `_results` contains invalid data `array`


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