structural.php

<?php

// $argv:
// 1 = trainnumber (letter(s) + number)
// 2 = from
// 3 = to
// 4 = crowding (0=empty, 1=in between, 2=busy)

if(count($argv) == 5) {
    $curl = curl_init();

    $url = "http://api.irail.be/vehicle/?id=BE.NMBS." . $argv[1];

    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

    $result = curl_exec($curl);
    curl_close($curl);

    $xml = simplexml_load_string($result);
    $stops = $xml->stops;

    $write = false;
    $errorCheck = 0;
    $text = "";
    $crowding = "?";

    foreach($stops->stop as $stop) {
        if($stop->station == $argv[2]) {
            if($errorCheck != 0) $errorCheck += 1;

            $crowding = $argv[4];
            $errorCheck += 1;
        }

        if($crowding != "?") {
            if($stop->station == $argv[2]) {
                $text .= $argv[1] . "," . $crowding . ",1," . $stop->station["URI"] . ",";
            } else if($stop->station != $argv[3]) {
                $text .= $stop->station["URI"] . "\n";
                $text .= $argv[1] . "," . $crowding . ",1," . $stop->station["URI"] . ",";
            } else {
                $text .= $stop->station["URI"] . "\n"; 
            }
        }

        if($stop->station == $argv[3] && $errorCheck == 1) {
            $errorCheck += 1;
            $crowding = "?";
        }
    }

    if($errorCheck != 2) echo "Error: stations niet overlopen\n";
    else $myfile = file_put_contents('structural.csv', $text.PHP_EOL, FILE_APPEND);
} else {
    echo "Error: geef 4 argumenten\n";
}

?>