3v4l.org

run code in 300+ PHP versions simultaneously
<?php $data1 = array("Peter" => "1", "Ann" => "1", "Susan" => "2", "Tom"=> "3", "John" => 3, "Jenny" => 3); $counts =array_count_values($data1); rsort($counts); $find = $counts[0]; Var_dump(array_keys(array_intersect($data1, [$find])));
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(3) { [0]=> string(3) "Tom" [1]=> string(4) "John" [2]=> string(5) "Jenny" }
preferences:
72.51 ms | 1531 KiB | 4 Q