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<?php $test = ['a' => 1]; unset($test['b']); var_dump($test);
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.2
array(1) { ["a"]=> int(1) }
preferences:
54.69 ms | 406 KiB | 5 Q