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<?php class Test { public $a; public int $b; } $test = new Test; foreach ($test as $prop => &$value) { $value = 42; } var_dump($test);
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
object(Test)#1 (1) { ["a"]=> &int(42) ["b"]=> uninitialized(int) }

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