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run code in 200+ php & hhvm versions
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<?php $foo[][] = 1; $foo[][] = 1; $foo[][] = 1; var_dump($foo);
based on BdnpL
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(3) { [0]=> array(1) { [0]=> int(1) } [1]=> array(1) { [0]=> int(1) } [2]=> array(1) { [0]=> int(1) } }