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run code in 150+ php & hhvm versions
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<?php $tab1 = array(); $tab1[] = 1; $tab2 = array(); $tab2[] = 2; $tab1 += $tab2; print_r($tab1);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 1 )