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

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

Output:

Const keyword

Example 2

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

Output:

Const keyword
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