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<?php class NullableA { private function __construct() {} public ?string $string; public static function &string(?string $defaultValue = null) { $type = new self; $type->string = $defaultValue; return $type->string; // type is garbage collected } } class NullableB { private static $antiGarbageCollect = []; private function __construct() {} public ?string $string; public static function &string(?string $defaultValue = null) { $type = new self; self::$antiGarbageCollect[] = $type; $type->string = $defaultValue; return $type->string; } } $a =& NullableA::string(); $a = 123; var_dump($a); $b =& NullableB::string(); $b = 123; var_dump($b);
Output for git.master, git.master_jit, rfc.property-hooks
int(123) string(3) "123"

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