namecheck.php

<?php
/**
 *   https://github.com/Bigjoos/
 *   Licence Info: GPL
 *   Copyright (C) 2010 U-232 v.3
 *   A bittorrent tracker source based on TBDev.net/tbsource/bytemonsoon.
 *   Project Leaders: Mindless, putyn.
 *
 */
if (empty($_GET['wantusername'])) {
    die('Silly Rabbit - Twix are for kids - You cant post nothing please enter a username !');
}
sleep(1);
require_once (dirname(__FILE__).DIRECTORY_SEPARATOR.'include'.DIRECTORY_SEPARATOR.'bittorrent.php');
dbconn();
$HTMLOUT = "";
$lang = array_merge(load_language('global') , load_language('takesignup'));
function validusername($username)
{
    global $lang;
    if ($username == "") return false;
    $namelength = strlen($username);
    if (($namelength < 3) OR ($namelength > 32)) {
        $HTMLOUT = "";
        $HTMLOUT.= "<font color='#cc0000'>{$lang['takesignup_username_length']}</font>";
        echo $HTMLOUT;
        exit();
    }
    // The following characters are allowed in user names
    $allowedchars = $lang['takesignup_allowed_chars'];
    for ($i = 0; $i < $namelength; ++$i) {
        if (strpos($allowedchars, $username[$i]) === false) return false;
    }
    return true;
}
if (!validusername($_GET["wantusername"])) {
    $HTMLOUT.= "<font color='#cc0000'>{$lang['takesignup_allowed_chars']}</font>";
    echo $HTMLOUT;
    exit();
}
if (strlen($_GET["wantusername"]) > 12) {
    $HTMLOUT.= "<font color='#cc0000'>{$lang['takesignup_username_length']}</font>";
    echo $HTMLOUT;
    exit();
}
$checkname = sqlesc($_GET["wantusername"]);
$sql = "SELECT username FROM users WHERE username = $checkname";
$result = sql_query($sql);
$numbers = mysqli_num_rows($result);
if ($numbers > 0) {
    while ($namecheck = mysqli_fetch_assoc($result)) {
        $HTMLOUT.= "<font color='#cc0000'><img src='{$INSTALLER09['pic_base_url']}cross.png' alt='Cross' title='Username  Not Available' align='absmiddle' /><b>Sorry... Username - ".htmlsafechars($namecheck["username"])." is already in use.</b></font>";
    }
} else {
    $HTMLOUT.= "<font color='#33cc33'><img src='{$INSTALLER09['pic_base_url']}tick.png' alt='Tick' title='Username Available' align='absmiddle' /><b>Username Available</b></font>";
}
echo $HTMLOUT;
exit();
?>