PHP Sort Multidimensional array with key value

<?php
$needSort = array(
    array("name" => "Bob", "age" => 8, "colour" => "red"),
    array("name" => "Greg", "age" => 12, "colour" => "blue"),
    array("name" => "Andy", "age" => 5, "colour" => "purple")
);
echo "<h3>Original Array</h3><pre>";
print_r($needSort);
echo "</pre>";

$orderBy = "name";
$sortArray = array();
$sortArray[$orderBy] = array();

foreach ($needSort as $obj) {
    $sortArray[$orderBy][] = $obj[$orderBy]; //Sort by name
}

array_multisort($sortArray[$orderBy], SORT_ASC, $needSort);

echo "<h3>Sorted Array</h3><pre>";
print_r($needSort);
echo "</pre>";
?>

Output

Original Array

Array
(
    [0] => Array
        (
            [name] => Bob
            [age] => 8
            [colour] => red
        )

    [1] => Array
        (
            [name] => Greg
            [age] => 12
            [colour] => blue
        )

    [2] => Array
        (
            [name] => Andy
            [age] => 5
            [colour] => purple
        )

)


Sorted Array

Array
(
    [0] => Array
        (
            [name] => Andy
            [age] => 5
            [colour] => purple
        )

    [1] => Array
        (
            [name] => Bob
            [age] => 8
            [colour] => red
        )

    [2] => Array
        (
            [name] => Greg
            [age] => 12
            [colour] => blue
        )

)