PHP Constants !!
Constants
Constants in PHP is name or identifier that can not be changed during the execution.
Constant start with letter or underscore is valid.
There is no need of $ sign with constant name.
We can define constant by two methods :
Using define() function
In this method we use define function().
Syntax
define (name, value, case-insensitive)
Here,
name : name of the constant
value : value of the constant
case-insensitive : by default constant is case sensitive.
we can set true or false value of case-insensitive.
Program :
Output :
NibKarma PHP Tutorial!!
In above program msg = constant name, value = Nibkarma PHP Tutorial!!, and by default is case sensitive.
Let's take an example Of Case - sensitive.
Program :
Output :
Case-insensitive - true
When we set parameter case-insensitive is true. it is not case sensitive.
Program :
Output :
NibKarma PHP Tutorial!!
NibKarma PHP Tutorial!!
Case-insensitive - false
It is case sensitive, it work as by default case-insensitive works.
It generates error of undefined constant.
Program :
Output :
using const keyword
Const keyword define constant at compile time.
It is not a function.
It is always case sensitive.
Syntax :
const name = value ;
Program :
Output :
NibKarma PHP Tutorial!!
In these article we discussed about Constants in PHP. and methods for declare consts define() and const keyword. I hope you learn easily from this article.
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