Question

Just building on top of my previous question here:

Rewriting a JSON string – grouping keys by value into a new array?

I am wondering how do I traverse the array given and resort it so that the output comes out something like this:

[{
"Name": "Title 1",
"Date": "2012-12-05",
"rows": [
    {
        "Subtitle": "Subtitle 1",
        "Count1": 566,
        "Count2": 105
    },
    {
        "Subtitle": "Subtitle 2",
        "Count1": 76,
        "Count2": 15
    }
    ]
}, 
{
"Name": "Title 2",
"Date": "2012-12-06",
"rows": [
    {
        "Count1": 66,
        "Count2": 5
    }...

where the original json array is grouped by “Name” column, and then sorted into multi-level structure like this (parent/multiple child json structure for properly building menu in our application)?

The original json data looks like this:

[{
"Name": "Title 1",
"Subtitle": "Subtitle 1",
"Count1": 556,
"Count2": 5,
"Date": "2012-12-05"
}, {
"Name": "Title 1",
"Subtitle": "Subtitle 2",
"Count1": 10,
"Count2": 100,
"Date": "2012-12-05"
}, {
"Name": "Title 3",
"Subtitle": "Subtitle 3",
"Count1": 798,
"Count2": 11,
"Date": "2012-12-04"
}...

and obviously I am looking for a solution in PHP, as I will read in the json data, process it and spit it out reformatted.

Answer 1

Assuming associative arrays and sorting output by name:

$output = array();

for ($data as $row) {

    if (!isset($output[$row['Name']])) {
        $output[$row['Name']] = array(
            'Name' => $row['Name'],
            'Date' => $row['Date'],
            'rows' => array()
        );
    }

    $output[$row['Name']]['rows'][] = array(
        'Subtitle' => $row['Subtitle'],
        'Count 1'  => $row['Count 1'],
        'Count 2'  => $row['Count 2'] 
    );
}