<?php$arr = [[1, 9, 9, 5], [1, 9, 9, 6], [1, 9, 9, 7], [1, 9, 9, 8]];$arr = array_map('implode', $arr); var_dump($arr);
Standard input is empty
array(4) { [0]=> string(4) "1995" [1]=> string(4) "1996" [2]=> string(4) "1997" [3]=> string(4) "1998" }
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