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PHP SOLUTIONS: DYNAMIC WEB DESIGN MADE EASY There is a fifth type of error: strict, which was introduced in PHP 5.0.0, mainly for the benefit of advanced developers. Strict error messages warn you about the use of depre- cated code or techniques that aren t recommended. As of this writing, strict error mes- sages are not displayed by default, but there are plans to change this as a prelude to removing outdated parts of the language. The idea is to warn you that anything that generates a strict error in PHP 6 will generate a fatal error in the next major version, PHP 7. This policy is in the early stages of development, so it may change, but if you see a strict error message, ignore it at your peril. None of the code in this book generates strict error messages in the version of PHP current at the time of this writing (5.1.4). Now, on with the show . . . Your head is probably reeling by now, but believe it or not you have covered all the fundamentals of PHP. Of course, there are a lot more details, many of which are described in the reference section that follows. However, rather than plowing straight on, I suggest you take a short break and then move on to the next chapter. Come back to the next section when you ve gained some practical experience of working with PHP, as it will make much more sense then. Also, the idea of this book is to put PHP to work and provide real solutions for your websites. The projects in each chapter use progressively more advanced techniques, so if you re new to PHP, cut your teeth on them first before plunging into working with a database. PHP: A quick reference This part of the chapter is intended to provide a quick source of information on PHP basics. It makes no attempt to cover every aspect of PHP syntax. For that, you should refer to the PHP documentation at www.php.net/manual/en or a more detailed reference book, such as Beginning PHP and MySQL 5: From Novice to Professional, Second Edition by W. Jason Gilmore (Apress, ISBN: 1-59059-552-1). Using PHP in an existing website There is no problem mixing .html and .php pages in the same website. However, PHP code will be processed only in files that have the .php filename extension, so it s a good idea to give the same extension to all your pages, even if they don t all contain dynamic features. That way, you have the flexibility to add PHP to pages without breaking existing links or losing search engine rankings. Data types in PHP PHP is what s known as a weakly typed language. What this means in practice is that, unlike some other computer languages (e.g., Java or C#), PHP doesn t care what type of data you store in a variable.
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