The PHP Environment

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The PHP environment is a series of programs and library files. These programs are unusual because the user never runs them directly. Instead, a user requests a PHP program from a web server and the server calls upon PHP to process the instructions in the file. PHP then returns HTML code, which the user sees in the browser. This book was written using PHP 6.0, although most of the code works well on earlier versions of PHP.

Although the code in this book will generally work on earlier versions of PHP, code written in earlier versions of PHP won’t always work on PHP 6. This is unusual, as many languages strive to be backwards compatible. PHP 6 fixes a large number of security vulnerabilities; so much of the code written in earlier versions needs to be modified
 
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