<?php enum Gender { case UNKNOWN; case MALE; case FEMALE; } /** * @template T as BackedEnum|UnitEnum * @param class-string<T> $enumClass * @param string $name * @return T|null */ function tryFromName(string $enumClass, string $name) { $constName = $enumClass . '::' . $name; return is_subclass_of($enumClass, UnitEnum::class) && defined($constName) ? constant($constName) : null; } var_dump(tryFromName(Gender::class, 'UNKNOWN'));// enum(Gender::UNKNOWN) var_dump(tryFromName(Gender::class, 'MALE'));// enum(Gender::MALE) var_dump(tryFromName(Gender::class, 'FEMALE'));// enum(Gender::FEMALE) var_dump(tryFromName(Gender::class, 'null'));// NULL
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