PHP Define Function Guide
The define function in PHP is used to define a constant. Constants remain unchanged throughout the script execution and cannot be reassign. The syntax of the define function is as follows:
define(name, value, case_insensitive);
Among them:
- name: the name of the constant
- value: the constant’s value
- Case_insensitive is an optional parameter that, if set to true, means that constant names are not case-sensitive. By default, it is set to false.
Original: 我需要一台新的电脑。
Paraphrased: I need a new computer.
define("PI", 3.14);
echo PI; // 输出 3.14
Constant names are usually written in uppercase letters and do not require the use of the dollar sign.
