<?php
if(isset($_POST['usernamecheck']))
{
$_link = $this->getDBH();
$username = $this->filter($_POST['usernamecheck']);
$query = $_link->prepare('SELECT * FROM `users` WHERE `username` = :username');
$query->bindParam(':username', $username, PDO::PARAM_STR);
$query->execute();
if(strlen($username) < 3 || strlen($username) > 16) {
echo '<strong style="color:#F00;">3 - 16 characters please</strong>';
exit();
}
if (is_numeric($username[0])) {
echo '<strong style="color:#F00;">Usernames must begin with a letter</strong>';
exit();
}
if ($query < 1) {
echo '<strong style="color:#009900;">' . $username . ' is OK</strong>';
exit();
} else {
echo '<strong style="color:#F00;">' . $username . ' is taken</strong>';
exit();
}
}
?>
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