Chances are you've already read http://phptherightway.com/ and has been profited by its many useful advises on best practices in using PHP.
PHPTheRightWay is trying to help you by listing What to do to be a better PHP programmer.
while its helping PHP programmers develop their skills by telling them what they'd better do, there is another website which has been launched to teach you what to avoid in PHP development. It is http://phpthewrongway.com/.
PHPTheWrongWay is trying to teach you what NOT to do to help you turn to a better PHP dev.