PHP SQL cURL GW2 API v2 Tradepost

<?php
# Get the all the items numbers
$url1 = "http://api.guildwars2.com/v2/commerce/listings";
$response1 = file_get_contents($url1);
$data1 = json_decode($response1, true);
$amount_added_to_db = 0;

# Process in chunks to avoid out of memory error
$chunksize = round(sizeof($data1)/10); #round(sizeof($data1)/10); # divided by 10 equals around 2215
$offset = 9*$chunksize;
$length = $chunksize;
$splitsize = 25; # maximum 200

$smallchunk = array_slice($data1,$offset, $length);
$splitted_smallchunk = array_chunk($smallchunk, $splitsize);

#Retrieve item names and link with numbers
function request_callback($response,$info) {
    global $associative_array;
    if($info['http_code'] === 200){
        $temporary_array = json_decode($response, true);
            foreach ($temporary_array as $value){
                $associative_array[] = array('name' => $value['name'],'id' => $value['id']);
            }
        }
    }

# Queue up multiple curl request for handling
require("rollingcurl.php"); // from https://github.com/LionsAd/rolling-curl

foreach ($splitted_smallchunk as $urlstring){
        $urlstring = implode (',',$urlstring);
        $urls[] = "https://api.guildwars2.com/v2/items?ids={$urlstring}";
}

$rc = new RollingCurl("request_callback");
$rc->window_size = 20;
foreach ($urls as $url) {
     $request = new  RollingCurlRequest ( $url ) ;
     $rc -> add ( $request ) ;
}
$rc->execute();



try {
        # Make a connection to the database
        $db = new PDO('sqlite:/var/www/gw2db/gw2.sqlite');
        $db ->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        # Create the database (if already made, IF NOT EXISTS will prevent error)
        $db->exec("CREATE TABLE IF NOT EXISTS alltheitems (Id INTEGER PRIMARY KEY, itemname TEXT, itemnumber INTEGER)");

        # Prepare the query ONCE
        $stmt = $db->prepare('INSERT INTO alltheitems (itemname, itemnumber) VALUES(:name, :number)');
        $stmt->bindParam(':name', $itemname, SQLITE3_TEXT);
        $stmt->bindParam(':number', $itemnumber, SQLITE3_INTEGER);

        # Insert values and execute statements
        for ($x=0;$x<sizeof($associative_array);$x++){
            $itemname = $associative_array[$x]['name'];
            $itemnumber = $associative_array[$x]['id'];

                # Check if the item is already in the database or invalid URL return
                $duplicatecheck = $db->query("SELECT * FROM alltheitems WHERE itemnumber LIKE '$itemnumber'");
                $alreadyinDB=0;
                foreach($duplicatecheck as $row)
                    {
                      $alreadyinDB=1;
                    }

            if ($alreadyinDB==0) {
                $stmt->execute();
                $amount_added_to_db = $amount_added_to_db + 1;
            }
        }


        $fetchdb = $db->query("SELECT itemnumber, itemname FROM alltheitems");

        # Make array from fetchdb object
        $data_array = $fetchdb->fetchAll();

        if ($amount_added_to_db > 0){

            $data_array_latest_added = array_slice($data_array,-$amount_added_to_db);


            function request_callback2($response,$info) {
                global $joint_array;
                $db2 = new PDO('sqlite:/var/www/gw2db/gw2.sqlite');
                $temporary_array = json_decode($response, true);

                if (($info['http_code'] === 200) && (is_array($temporary_array))){

                    foreach ($temporary_array as $value){
                            $idnumber = $value['id'];
                            $searchname = $db2 ->query("SELECT itemname FROM alltheitems WHERE itemnumber LIKE '$idnumber'");
                            $searcharray = $searchname->fetchAll();
                            $itemname = $searcharray[0]['itemname'];

                            $joint_array[]= array('name'=>$itemname, 'id'=>$value['id'],'buys'=>$value['buys'],'sells'=>$value['sells']);
                            #echo $itemname; echo " with id# "; echo $idnumber; echo " has been added to joint_array "; echo "\n";
                    }

                }

                $db2 = NULL;
            }



            $splitted_dala = array_chunk($data_array_latest_added, $splitsize);


            foreach ($splitted_dala as $urlnumbers){
                    $temp = $urlnumbers;
                    $ids = array();
                        foreach ($temp as $value){
                            $ids[] = $value['itemnumber'];
                            $idstring = implode (',',$ids);
                        }
                    $TPurls[]="https://api.guildwars2.com/v2/commerce/listings?ids={$idstring}";
                    unset($ids);

            }

            $rc = new RollingCurl("request_callback2");
            $rc->window_size = 20;
            foreach ($TPurls as $url) {
                 $request = new  RollingCurlRequest ( $url ) ;
                 $rc -> add ( $request ) ;
            }
            $rc->execute();

            #echo '<pre>'; print_r($joint_array); echo '</pre>';

            for ($y=0; $y<sizeof($joint_array);$y++) {

                $totalbuys = 0;
                $totalsells = 0;
                $totalbuyprice = 0;
                $totalsellprice = 0;

                for ($x=0;$x<sizeof($joint_array[$y]['buys']);$x++) {
                    $totalbuys = $joint_array[$y]['buys'][$x]['listings'] * $joint_array[$y]['buys'][$x]['quantity'] + $totalbuys;
                    $totalbuyprice = $joint_array[$y]['buys'][$x]['listings'] * $joint_array[$y]['buys'][$x]['quantity'] * $joint_array[$y]['buys'][$x]['unit_price'];
                    $countB = $x;
                    if ($totalbuys >= 1000){
                        break;
                    }
                }

                for ($x=0;$x<sizeof($joint_array[$y]['sells']);$x++) {
                    $totalsells = $joint_array[$y]['sells'][$x]['listings'] * $joint_array[$y]['sells'][$x]['quantity'] + $totalsells;
                    $totalsellprice = $joint_array[$y]['sells'][$x]['listings'] * $joint_array[$y]['sells'][$x]['quantity'] * $joint_array[$y]['sells'][$x]['unit_price'];
                    $countS = $x;
                    if ($totalsells >= 1000){
                        break;
                    }
                }

                if (($totalsells >= 1000) && ($totalbuys >= 1000)){
                    $totalbuyprice = $totalbuyprice - ($totalbuys - 1000)* $joint_array[$y]['buys'][$countB]['unit_price'];
                    $totalsellprice = $totalsellprice - ($totalsells - 1000)* $joint_array[$y]['sells'][$countS]['unit_price'];

                    $ratio = $totalbuyprice / ($totalsellprice + $totalbuyprice);
                    $ratio_small = number_format((float)$ratio, 2, '.', '');
                } else {
                    $ratio_small = 0;
                }

                $db->exec("CREATE TABLE IF NOT EXISTS rating (Id INTEGER PRIMARY KEY, itemnumber INTEGER, itemname TEXT, itemratio REAL)");

                    # Prepare the query ONCE
                    $stmt = $db->prepare('INSERT INTO rating (itemnumber, itemname, itemratio) VALUES(:number, :name, :ratio)');
                    $stmt->bindParam(':number', $itemnumber, SQLITE3_INTEGER);
                    $stmt->bindParam(':name', $itemname, SQLITE3_TEXT);
                    $stmt->bindParam(':ratio', $itemratio, SQLITE3_FLOAT);

                    # Insert values and execute statements
                    $idnumber = $joint_array[$y]['id'];
                    #echo $joint_array[$y][id];'<br>';
                    $alreadyinDBcheck = $db->query("SELECT * FROM rating WHERE itemnumber LIKE '$idnumber'");
                        $found=0;
                        foreach($alreadyinDBcheck as $row)
                            {
                                $found=1;
                            }
                        if ($found==0) {
                            $itemratio = $ratio_small;
                            $itemnumber = $joint_array[$y]['id'];
                            $itemname = $joint_array[$y]['name'];
                            $stmt->execute();
                        } else {
                            $db->exec("UPDATE rating SET itemratio='$ratio_small' WHERE itemnumber LIKE '$joint_array[$y][id]'");
                            #echo ' already in DB <br>';
                            }



            }
        }

        # add creation timestamp
        date_default_timezone_set("Europe/Amsterdam");
        $time = "This page has been updated at " . date("d-m-Y h:i:sa"). "<br><br>";
        $db->exec("CREATE TABLE IF NOT EXISTS creationtime (Id INTEGER PRIMARY KEY, timestring TEXT)");
            $stmt = $db->prepare('INSERT INTO creationtime (timestring) VALUES(:time)');
            $stmt->bindParam(':time', $timestring, SQLITE3_TEXT);
            $timestring = $time;
            $stmt->execute();

        # Clear the table
        #$db-> exec ('DELETE FROM rating');
        #$db-> exec ('DELETE FROM alltheitems');

        # close the database connection
        $db = NULL;

    }

    catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
}




?>