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<?php $map = new WeakMap(); $object = new stdClass(); $map[$object] = null; var_dump(gettype($map[$object])); var_dump(isset($map[$object]));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.23, 8.3.0 - 8.3.11
string(4) "NULL" bool(false)
preferences:
54.65 ms | 406 KiB | 5 Q