Web Services Programming

<html>
<body bgcolor="white">
<div align="center">
<b>Find Assigned Bugs</b>
<?php
    $base = "$PHP_SELF{$_SERVER['PATH_INFO']}";
    $action = isset($_SERVER['QUERY_STRING'])?"{$base}?{$_SERVER['QUERY_STRING']}":$base;
?>
<form action="<?php echo $action; ?>" method="GET">
Developer Name: <input type="text" value="" name="dev_name"> 
<input type="submit" name="submit" value="Search">
</form>
<?php
function decode($data, &$res)
{
    $pos = 0;
    $res = array();
    $num_results = (int) substr($data, 0, 10);
    $pos += 10;
    for ($i = 0; $i < $num_results; $i++) {
        /* decode bug id */
        $len = (int) substr($data, $pos, 10);
        $pos += 10;
        $res[$i]['id'] = substr($data, $pos, $len);
        $pos += $len;

        /* decode bug description */
        $len = (int) substr($data, $pos, 10);
        $pos += 10;
        $res[$i]['descr'] = substr($data, $pos, $len);
        $pos += $len;
    }
    return $num_results;
}

if (!empty($_GET['dev_name'])) {
    $url = 'http://' . $_SERVER['HTTP_HOST'];
    $url .= preg_replace('!show\.php.*$!', 'presentations/slides/web_services/ipip_server.php', $_SERVER["SCRIPT_NAME"]);

    $data = file_get_contents($url."?q=" . urlencode($_GET['dev_name']));

    /* decode the result set */
    $num_results = decode($data, $res);
    if (!$num_results) {
        echo "No results found.";
    } else {
        foreach ($res as $ent) {
            echo "Bug #: {$ent['id']}<br />\n{$ent['descr']}<hr />\n";
        }
    }
}
?>
</div>
</body>
</html>