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run code in 200+ php & hhvm versions
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<?php $a1 = array('a', 'b'); $a2 = array('foo' => 'a', 'bar' => 'b'); $a1+= $a2; print_r($a1);
Output for 4.3.0 - 7.2.0
Array ( [0] => a [1] => b [foo] => a [bar] => b )