Open Bank Project Example on parsing transaction data

openbankproject.php

<?php

define('DS', DIRECTORY_SEPARATOR);
$offset = 0;
$limit = 100;
$path = 'banking' . DS;
$url = 'https://api.openbankproject.com/obp/v1.2.1/banks/postbank/accounts/tesobe/public/transactions';
$gross_amount=0;
@mkdir($path);
while (true) {
    $opts = array('http' => array('method' => "GET",
            'header' => "obp_limit: $limit\r\n" . "obp_offset: $offset\r\n"));
    $cache_fp = $path . md5($url) . "-$limit-$offset";
    //echo $cache_fp . "\n";
    if (!file_exists($cache_fp)) {
        echo "Retrieving data from the web\n";
        $file = file_get_contents($url, false, stream_context_create($opts));
        file_put_contents($cache_fp, $file);
    } else {
        //echo "Retrieving data from cache\n";
        $file = file_get_contents($cache_fp);
    }
    $data = json_decode($file);

    foreach ($data->transactions as $item) {
        print($item->details->completed . "\t");
        print($item->other_account->holder->name . "\t");      
        print($item->details->value->amount . "\t");
        $gross_amount +=$item->details->value->amount;
        print($item->details->value->currency . "\t");
        print("\n");
    }

    if (count($data->transactions) < $limit) {
        break;
    } else {
        $offset+=$limit;
    }
}
 print("$gross_amount \n");