PHP and highcharts: add mysql results as new column in CSV file

Question

I'm trying to prepare code which will run every hour and retrieve some DB data. I would like to store it as csv file and use it to create chart from highcharts. Problem: I'm unable to create csv file which will be updated every hour according to this model:

01:00, 02:00, 03:00
dataA-01, dataA-02, dataA-03
dataB-01, dataB-02, dataB-03

So next column '04:00' with rows dataA-04 and dataB-04 will be added on 4am.

What I got:

class liveData 
{
    public $newCsvData = array();

    /*some sql here*/

    public function getHour() 
    {
        $hour = date('H:i');
        array_push($this->newCsvData, $hour);
    }

    public function getDataA() 
    {
        /*...*/
        array_push($this->newCsvData, $dataA);
    }

    public function getDataB() 
    {
        /*...*/
        array_push($this->newCsvData, $dataB);
    }

    public function saveCsv()
    {
        print_r($this->newCsvData);
        $fp = fopen('./tmp/test.csv', 'a+');
        fputcsv($fp, $this->newCsvData, ','); 
        fclose($fp);
    }

}

The result of print_r($this->newCsvData) is:

Array
(
    [0] => 21:00
    [1] => 12
    [2] => 40
)

The code works, but created test.csv looks of course like this:

21:00,12,40
21:01,15,45
21:03,18,62

and I need to get:

21:00,21:01,21:03
12,15,18
40,45,62

My problem might seems trivial, but really - and unfortunately - I've spent hours on this. I just can't imagine the proper way. Even if I'm able to get something like

21:00
12
40

Data on next hour is added to new line like this.

21:00
12
40
21:01
15
45

Should I use multidimensional array? Should I change fopen() from a+ to other option?
Can you please give me a hint?

Answer 1

In my opinion, from a logical perspective, I would use per row the output you have on this moment: dd-mm;data,data,... Is it logical to have the times on the X-axis? This would also mean you can use the append modus.

If you really want to keep the desired output then I would create an array per row something like:

$arr[0][] = '21:00';
$arr[1][] = 'data_b';
$arr[0][] = 'data_b';

$new_data = '';
foreach($arr as $row)
{
   $new_data .= implode(',', $row);
}

Note that you cannot use the append modus in this last situation that easily and that this might result in the need to retrieve more data from the database...

Answer 2

print_r($this->newCsvData) shoud be look like this:

$data = array(
    array( '21:00' ),
    array( '12' ),
    array( '40' ),
);

and in second step, shoud be look like this:

$data = array(
    array( '21:00', '21:01' ),
    array( '12', '15' ),
    array( '40', '40' ),
);

and third step, same:

so who you can do this. Each time you import all data from CSV file and push each cell to the corresponding array and look like this

$newArray = array(array(), array(), array());
foreach($dataFromCSV as $data)
{
   array_push($newArray[0][], $data[0]);
   array_push($newArray[1][], $data[1]);
   array_push($newArray[2][], $data[2]);
}

and then append the new record data in $newArray. delete the old data from CSV file and write on it with new data from $newArray.

:) enjoy