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PHP constants and variables. PHP constants and variables [constants] can be defined using the define () function. after PHP5.3.0, you can use the const keyword to define constants outside the class definition. Once a constant is set, PHP constants
PHP Constants and variables
"Constant"
Constants can be defined with the Define () function, and after PHP 5.3.0, constants can be defined outside the class definition using the Const keyword. Once a constant is defined, it can no longer be changed
In the past rarely so detailed to introduce the variables in PHP, constants and the use of magic constants and reference tables, this article for beginners have a need to understand the help of friends can refer to.
Variable:
Variables are used to
Almost all programming languages involve the concepts of variables and constants, and PHP is no exception. This section describes how variables and constants in the PHP language are applied.First, what are variables and constantsDuring program
This article mainly introduces the PHP constant, the constant syntax analysis, the interest friend's reference, hoped to be helpful to everybody.
One, constant
A constant is an identifier (first name) of a simple value. As the name implies, the
Php constants and variable usage. In the past, I rarely described the usage and reference tables of variables, constants, and magic constants in php in such detail, this article is of great help to beginners. if you need to know more about the usage
What is the difference between single quotes and double quotes in php? 1. the variables in double quotation marks are parsed and output, while those in single quotation marks are not parsed.2. The resolution speed of single quotes is faster than
In PHP, variables correspond to constants, constants are system constants, frame constants, and custom constants.
Defining constants can use the following
define("MY_FIELD",123); echo MY_FIELD;// 输出123// 如果定义常量是一个变量$name = "TEST";
This article mainly introduces the constants in PHP, interested in the reference of friends, I hope to be helpful to everyone.
A constant is an identifier (first name) of a simple value. The range of constants is global. Changshime is considered to
Document directory
I. Syntax
Ii. predefined Constants
[PHP series tutorial] (4) describes the PHP variable: http://blog.csdn.net/rocket5725/archive/2010/01/08/5159704.aspx
This section describes constants in PHP, including their syntax and
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