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run code in 200+ php & hhvm versions
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<?php $a = []; $a[10][20] = 5; var_dump($a);
based on cjXtj
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.1
array(1) { [10]=> array(1) { [20]=> int(5) } }