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run code in 200+ php & hhvm versions
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<?php $v = array(); $v[] = 'hola'; var_dump($v);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.1.7
array(1) { [0]=> string(4) "hola" }