为重复的ID键值创建多维数组

Question

I am trying to read in array values from a csv and create sub-arrays which belong to the primary key field ID. E.g currently, say I have the following array structure & content...

ID;number;product

1;K12;product1

2;157/03/2014;product1

2;;product2

2;product1

3;156/03/2014;product2

3;156/03/2014;product3

I have a php function:

function csv_to_array($file, $delimiter=';')
{
    if(!file_exists($file) || !is_readable($file))
        return FALSE;

    $header = NULL;
    $data = array();
    if (($handle = fopen($file, 'r')) !== FALSE)
    {
        while (($row = fgetcsv($handle, 1000, $delimiter)) !== FALSE)
        {
            if(!$header)
                $header = $row;
            else
                $data[] = array_combine($header, $row);
        }
        fclose($handle);
    }
    return $data;
}

Such a result would like to achieve

[1] => Array
    (
        [LP] => 1
        [number] => K12
        [product] => product1
    )
[2] => Array
    (
        Array
            (
                [LP] => 2
                [number] => 157/03/2014
                [product] => product1
            )
        Array
            (
                [product] => product2
            )               
        Array
            (
                [product] => product3
            )

Answer 1

Replace

data[] = array_combine($header, $row);

With

if(isset($data[$row[0]])) {
$data[$row[0]][] = array_combine($header, $row);
}
else {
$data[$row[0]] = array();
$data[$row[0]][] = array_combine($header, $row);
}