" ... In this three part article series, I present a list of 21 mistakes that I believe are frequently made and ranging in severity from non-critical down to those that can break the farm. I offer solutions, suggestions and/or comments on how to solve and prevent these errors, in addition to other tricks of the trade that I have gained over the years."
One of PHP's greatest strengths happens to be one of its greatest weaknesses as well: PHP is easy to learn. Many people are attracted to the language because of this, not realizing that it's a lot tougher to learn how to do it right.