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<?php $bad=array(); $good=array(); $a=['a','b','c']; $b=['c','d','e']; $bad += $a; $bad += $b; print_r($bad); $good = array_unique(array_merge($good, $a)); $good = array_unique(array_merge($good, $b)); print_r($good);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => a [1] => b [2] => c ) Array ( [0] => a [1] => b [2] => c [4] => d [5] => e )

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