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<?php function getSortedNames($data){ $result = []; if (empty($data)) return $result; foreach ($data as ['name' => $rname]) { $result[] = $rname; } sort($result); return $result; } $users1 = [ ['name' => 'Bronn', 'gender' => 'male', 'birthday' => '1973-03-23'], ['name' => 'Reigar', 'gender' => 'male', 'birthday' => '1973-11-03'], ['name' => 'Eiegon', 'gender' => 'male', 'birthday' => '1963-11-03'], ['name' => 'Sansa', 'gender' => 'female', 'birthday' => '2012-11-03'] ]; var_dump(getSortedNames($users1));