Phát triển web với PHP và MySQL - p 6

PHP Crash Course CHAPTER 1 25 One important difference between constants and variables is that when you refer to a constant, it does not have a dollar sign in front of it. If you want to use the value of a constant, use its name only. For example, to use one of the constants we have just created, we could type: echo TIREPRICE; 1 PHP CRASH COURSE As well as the constants you define, PHP sets a large number of its own. An easy way to get an overview of these is to run the phpinfo() command: phpinfo(); This will provide a list of PHP’s predefined variables and...
Nội dung trích xuất từ tài liệu:
Phát triển web với PHP và MySQL - p 6