Runescape Highscore lookup

<?php
$rsname = $_GET['rsname'];
$a = $_GET['a'];
$b = $_GET['b'];
$c = $_GET['c'];
$d = $_GET['d'];
$e = $_GET['e'];

if (empty($rsname)) {
    echo "Geen gebruikersnaam ingevoerd";
}

else {
$url = "http://hiscore.runescape.com/index_lite.ws?player=".$rsname;

$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$score = curl_exec($ch);
curl_close($ch);

$uitslag = preg_split("`(\n|,)`", $score);
if ($uitslag[0] == 0) { echo "Gebruikersnaam <b>" . $rsname . "</b> staat niet in de RuneScape highscores."; }
else {

$skills = array(
'Overall',
'Attack',
'Defence', 
'Strenght',
'Hitpoints',
'Range',
'Prayer',
'Magic',
'Cooking',
'Woodcutting',
'Fletching',
'Fishing',
'Firemaking',
'Crafting',
'Smithing',
'Mining',
'Herblore',
'Agility', 
'Thieving',
'Slayer',
'Farming',
'Runecrafting',
'Hunter',
'Construction',
'Summoning'
);


echo "RuneScape Hiscores van <b>" . $rsname . "</b>.";
echo "\n<br /><br />\n";
echo "<table width=\"700\"  border=\"0\">\n";

if ($a == 0) {
echo "<tr>";
if ($b == 0) { echo "<td><b>Skill</b></td>\n"; }
if ($c == 0) { echo "<td><b>Rank</b></td>\n"; }
if ($d == 0) { echo "<td><b>Level</b></td>\n"; }
if ($e == 0) { echo "<td><b>Exp</b></td>\n"; }
echo "</tr>";
}

$i = 0;
$ii = 0;
$iii = 1;
$iiii = 2;

while ($i <= 24):


$uitslag[$ii] = number_format($uitslag[$ii], 0, ',', ',');
$uitslag[$iiii] = number_format($uitslag[$iiii], 0, ',', ',');
if ($uitslag[$ii] == -1) { $uitslag[$ii] = " "; }
if ($uitslag[$iii] == -1) { $uitslag[$iii] = " "; }
if ($uitslag[$iiii] == -1) { $uitslag[$iiii] = "<i>Niet gevonden</i>\n"; }

echo "<tr>";
if ($b ==0) { echo "<td><b>" . $skills[$i] . "</b></td>\n"; }
if ($c ==0) { echo "<td>" . $uitslag[$ii] . "</td>\n"; }
if ($d ==0) { echo "<td>" . $uitslag[$iii] . "</td>\n"; }
if ($e ==0) { echo "<td>" . $uitslag[$iiii] . "</td>\n"; }
echo "</tr>";

    $i++;
    $ii = $ii + 3;
    $iii = $iii + 3;
    $iiii = $iiii + 3;
endwhile;
echo "\n</table>";
} }
?>