2.0). Chapter 9 introduces this important feature in great
detail and offers a general introduction to the often confusing regular expression
syntax.
In addition to these features, literally hundreds of functions were added to version 4,
greatly enhancing the language??™s capabilities. Many of these functions are discussed
throughout the course of the book.
PHP 4 represented a gigantic leap forward in the language??™s maturity, offering new
features, power, and scalability that swayed an enormous number of burgeoning and
expert developers alike. Yet the PHP development team wasn??™t content to sit on
their hands for long and soon set upon another monumental effort, one that could
establish the language as the 800-pound gorilla of the Web scripting world: PHP 5.
PHP 5
Version 5 was yet another watershed in the evolution of the PHP language. Although
previous major releases had enormous numbers of new library additions, version 5
contains improvements over existing functionality and adds several features
commonly associated with mature programming language architectures:
Vastly improved object-oriented capabilities: Improvements to PHP??™s objectoriented
architecture is version 5??™s most visible feature. Version 5 includes numerous
functional additions such as explicit constructors and destructors, object cloning,
class abstraction, variable scope, and interfaces, and a major improvement
regarding how PHP handles object management.
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