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@ 2013-07-31T18:00:39Z

<?php
// Everything you enter here will be executed by our servers. Try it!

$data = array(

array(
	'id' => 1,
    'name' => 'bob',
    'product_id' => 1,
    'product' => 'laptop',
    'price' => 999,
),

    array(
	'id' => 1,
    'name' => 'bob',
    'product_id' => 2,
    'product' => 'mouse',
    'price' => 15,
),
    array(
	'id' => 1,
    'name' => 'bob',
    'product_id' => 3,
    'product' => 'keyboard',
    'price' => 25,
),
    array(
	'id' => 2,
    'name' => 'steve',
    'product_id' => 1,
    'product' => 'book',
    'price' => 5,
),

    array(
	'id' => 2,
    'name' => 'steve',
    'product_id' => 2,
    'product' => 'mouse',
    'price' => 15,
),
    array(
	'id' => 2,
    'name' => 'steve',
    'product_id' => 3,
    'product' => 'keyboard',
    'price' => 25,
)
);

$output = array();

        $userColumnIntersect = array_flip(array(
            'id',
            'name',
        ));

        $productColumnIntersect = array_flip(array(
            'product',
            'price',
        ));
        foreach($data as $row){

            $id = $row['id'];

            if(!isset($output[$id])){
                $output[$id] = array_intersect_keys($row, $userColumnIntersect);
                $output[$id]['products'] = array();
            }

            $productId = $row['product_id'];

            if(!isset($output[$id]['products'][$productId])){
                $productDataRow = array_intersect_keys($row, $productColumnIntersect);
                $output[$id]['products'][$productId] = $productDataRow;
            }
        }


        echo '<pre>';
        print_r($output);

Output for 7.0.0 - 7.0.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Fatal error: Uncaught Error: Call to undefined function array_intersect_keys() in /in/P5AAI:68 Stack trace: #0 {main} thrown in /in/P5AAI on line 68
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28: Fatal error: Call to undefined function array_intersect_keys() in /in/P5AAI on line 68
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: array_intersect_keys() in /in/P5AAI on line 68
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: array_intersect_keys() in /in/P5AAI on line 68
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: array_intersect_keys() in /in/P5AAI on line 68

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