the memory of php study

define() function

 

 

: define a constant in php

 

the difference of constant and variable

 

: Don`t use "$" at the begin of name when define  a constant;

: the content of constant must be string or num;

 

 

 

define(name,value,case_insensitive)

 

case_insensitive

: default:false, case sensitive

  true : case insensitive

 

example:

 

define("GREETING","Hello world!");