Const keyword

Constants are one type of variable which we can define for any class with keyword const.
Value of these variables cannot be changed any how after assigning.
Class constants are different than normal variables, as we do not need $ to declare the class constants.
If we are inside the class then values of the constants can be get using self keyword, but accessing the value outside the class you have to use Scope Resolution Operator.

Example 1

<?php
	//create class
	class javatpoint
	{
		//create constant variable
		const a= "This is const keyword example";
	}
//call constant variable.
echo javatpoint::a;
?>

Output:

Example 2

<?php
	//create class
	class demo
	{
		//create constant variable
		const a= 10;
	}
//call constant variable.
echo demo::a;
?>

Output:

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