3v4l.org

run code in 150+ php & hhvm versions
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<?php $a = array(1); $b = array(4,5,6,9,0); $c = $a + $b; var_dump($c);
based on EdiNj
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> int(1) [1]=> int(5) [2]=> int(6) [3]=> int(9) [4]=> int(0) }