tailieunhanh - OBJECT-ORIENTED PHP Concepts, Techniques, and Code- P4

OBJECT-ORIENTED PHP Concepts, Techniques, and Code- P4:A number of years ago, before I started using PHP, I created dynamic web pages using C. This really wasn’t too different from some of the other options available at the time, though it seems almost unthinkable now. Creating a dynamic page meant outputting HTML from your script and recompiling that script if any changes needed to be made. | 3 OBJECT-ORIENTED FEATURES NEW TO PHP 5 PHP 3 was released in mid-1998. Some basic object-oriented OO capabilities were included more or less as an afterthought to provide new ways of accessing arrays. 1 No significant changes were made to the object model when version 4 was released in mid-2000. The basics of object-oriented programming OOP were there you could create a class and single inheritance was supported. With the release of PHP 5 in 2004 there was plenty of room for improving PHP s OO capabilities. At this point Java the most popular OO language to date had already been around for almost 10 years. Why did it take PHP so long to become a full-fledged OO language The short answer is because PHP is principally a web development language and the pressures of web development have only recently pushed it in this direction. 1 See Zeev Suraski Object-Oriented Evolution of PHP available at webdev Article 10007 0 page 1. Accessed March 27 2006. Support for objects has been grafted onto the language you can choose to use objects or simply revert to procedural programming. That PHP is a hybrid language should be viewed as something positive not as a disadvantage. There are some situations where you will simply want to insert a snippet of PHP and other situations where you will want to make use of its OO capabilities. As I have already argued in Chapter 1 in some cases an OO solution is the only solution. PHP 5 recognizes this fact and incorporates a full-blown object model consolidating PHP s position as the top server-side scripting language. Like Chapter 2 this will be a chapter of broad strokes. I ll give a general overview of how the object model has been improved and then I ll get into the details using concrete examples in later chapters. I ll also address the issue of backward compatibility. Access Modifiers Chapter 2 identified access modifiers as an essential element of an OO language. PHP 5 gives us everything we would expect in this area. In .

TỪ KHÓA LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.