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<?php $test = array(); $test['yo'][] = 123; var_dump($test);
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["yo"]=> array(1) { [0]=> int(123) } }