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<?php function getSortedNames($array) { $newarray = []; foreach ($array as $item) { $names = array_values($item); $newarray[] = $names[0]; } $result = sort($newarray); return $result; } $users = [ ['name' => 'Bronn', 'gender' => 'male', 'birthday' => '1973-03-23'], ['name' => 'Reigar', 'gender' => 'male', 'birthday' => '1973-11-03'], ['name' => 'Eiegon', 'gender' => 'male', 'birthday' => '1963-11-03'], ['name' => 'Sansa', 'gender' => 'female', 'birthday' => '2012-11-03'] ]; $t = getSortedNames($users); print_r($t);