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<?php $o = new stdClass(); $b = 'a'; $o->a = array ( 'foo' => 1, 'bar' => 2 ); $r = &$o->$b; unset($r['foo']); var_dump($o);
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(stdClass)#1 (1) { ["a"]=> &array(1) { ["bar"]=> int(2) } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(stdClass)(1) { ["a"]=> &array(1) { ["bar"]=> int(2) } }

preferences:
217.28 ms | 401 KiB | 313 Q