<?php $a = array_merge([1,2,3,4,5], [1,2,3,4,5]);sort($a);print_r($a);
Standard input is empty
Array ( [0] => 1 [1] => 1 [2] => 2 [3] => 2 [4] => 3 [5] => 3 [6] => 4 [7] => 4 [8] => 5 [9] => 5 )
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