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run code in 150+ php & hhvm versions
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<?php $a = array(1,2,3); $b = array(array(1),array(2),3); $f = array(array(2),array(3),4); $c = array(array_merge($a, $b, $f)); $d = array_unique($c); var_dump($d);
based on IDhWn
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
array(1) { [0]=> array(9) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> array(1) { [0]=> int(1) } [4]=> array(1) { [0]=> int(2) } [5]=> int(3) [6]=> array(1) { [0]=> int(2) } [7]=> array(1) { [0]=> int(3) } [8]=> int(4) } }
Output for hhvm-3.10.0 - 3.12.0
Notice: Array to string conversion in /in/6oToo on line 9 array(1) { [0]=> array(9) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> array(1) { [0]=> int(1) } [4]=> array(1) { [0]=> int(2) } [5]=> int(3) [6]=> array(1) { [0]=> int(2) } [7]=> array(1) { [0]=> int(3) } [8]=> int(4) } }