php transpose data

transpose.php

<?php
// dummy implementation by someone on internet
// https://medium.com/@shaun_morrow/transposition-in-php-ef49dde5ca15
function transposeData($data)
{
    $retData = array();
    foreach ($data as $row => $columns) {
        foreach ($columns as $row2 => $column2) {
            $retData[$row2][$row] = $column2;
        }
    }
    return $retData;
}
// smarter way
function myTransposeData($data){
    return array_map(function (...$lines){
        return $lines;
    }, ...$data);
};
$data = array(
    array('Products', '2012','2013','2014','2015'),
    array('Product A', '200', '100', '150', '50'),
    array('Product B', '50', '80', '120', '160'),
    array('Product C', '0', '50', '200', '180')
);

$data1 = transposeData($data);
$data2 = myTransposeData($data);
var_dump($data2);
var_dump($data1 == $data2);