Multidimensional array function i seem to use on rare occasions, maybe someone knows a faster way?

invertMultidimensionalArray.php

<?php
/**
 * Invert a multidimensional array
 * @param  array $origArray
 * @return array
 */
function invertMultidimensionalArray($origArray) {
    $invertedArray = array();
    foreach ($origArray as $i => $sub) {
        foreach ($sub as $key => $val) {
            $invertedArray[$key][$i] = $val;
        }
    }
    return $invertedArray;
}

<?php
//
// Test example, traffic stats
//
$testArray = array(
    array('direct' => 456, 'adwords' => 226, 'organic' => 301),
    array('direct' => 421, 'adwords' => 280, 'organic' => 300),
    array('direct' => 382, 'adwords' => 256, 'organic' => 314)
);
print_r( invertMultidimensionalArray($testArray) );
?>

Results in ->

Array
(
    [direct] => Array
        (
            [0] => 456
            [1] => 421
            [2] => 382
        )

    [adwords] => Array
        (
            [0] => 226
            [1] => 280
            [2] => 256
        )

    [organic] => Array
        (
            [0] => 301
            [1] => 300
            [2] => 314
        )

)