define("CONSTANT", "Hello world."); echo CONSTANT;

How to Define a Constant in PHP? Is $ symbol necessary?

Question Posted / abhishek baranwal

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Answer Posted / abhishek baranwal

define("CONSTANT", "Hello world.");

echo CONSTANT; // Outputs Hello world

define("CONSTANT", "New Value");

echo CONSTANT; // Outputs Hello world

Means once you declair the define a constant value that
will become every time it will not take new value or it
will not redeclair.if you want change in value then declair
the variables for that purpose.

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