php - 未定義関数 PHP MYSQL

Question

なぜこのエラーが発生し続けるのかを理解しようとしています:

PHP 致命的なエラー: 102 行目の /home/lear/public_html/storescripts/my_ipn.php の未定義関数 uniqueName() の呼び出し

102行目

if ( ! uniqueName($username))

require_once 'connect_to_mysql.php';

//now to always get unique username
$username = substr($payer_email, 0, strpos($payer_email, '@'));
if ( ! uniqueName($username))
{
    $username = makeUniqueName($username);
}


//function to check if is the existing username
function isUniqueName($username)
{
    $sql = mysql_query("SELECT username FROM transactions WHERE username='$username'");
    $numRows = mysql_num_rows($sql);
    if ($numRows > 0)
    {
        return false;
    }

    return true;
}


//function to generate new unique username
function makeUniqueName($username)
{
    //serch username string for number at the end
    //regexp makes sure all preceeding zeroes go to first match group
    if (preg_match('/^(\S*?0*)?(\d+?)$/', $username, $match))
    {
        //we got digit from the end of string, just add 1 to the digit
        $username = $match[1] . ($match[2] + 1);
    }
    else
    {
        //no digit at the end of string, just add digit 1 at the end
        $username = $username . 1;
    }

    if (isUniqueName($username))
    {
        return $username;
    }

    return makeUniqueName($username);
}

Answer 1

であってはなりif ( ! isUniqueName($username))ませんif ( ! uniqueName($username))。前に注意してくださいis。

Answer 2

あなたは呼び出しuniqueNameていますが、あなたのメソッドは呼び出されていますisUniqueName。