1--TEST-- 2ReflectionEnum::isBacked() 3--FILE-- 4<?php 5 6enum Enum_ {} 7enum IntEnum: int {} 8enum StringEnum: string {} 9 10function test(): string {} 11 12var_dump((new ReflectionEnum(Enum_::class))->isBacked()); 13var_dump((new ReflectionEnum(IntEnum::class))->isBacked()); 14var_dump((new ReflectionEnum(StringEnum::class))->isBacked()); 15 16?> 17--EXPECT-- 18bool(false) 19bool(true) 20bool(true) 21