PHP define() function

This is used to define a named constant. A Constant is a name for a value. Like if we want to give a name to a sentence 'What is in your mind'. We can assign a constant name to this sentence.

Syntax

 define("CONST_NAME", "Description"); 

Example

<?php
   define("STATUS", "What is in your mind");
?>		
Constant value cannot be changed during execution of the script. Once a constant is initialized, it cannot be set to another value. Constant name is accessed globally by default. Once a constant is defined in configuration file we can call this all over the project without redeclaring this. Generally a constant name has defined in upper case letter. We can also follow the same rule for the constant name as for variable except it doesn't have a leading dollar sign PHP 7 provides feature to define array constant using define function. This is the syntax of PHP Constant -

define("CONSTANT_NAME", "CONSTANT_VALUE", "Case Sensitive");
We define a constant using define function. "CONSTANT_NAME" is a string. "CONSTANT_VALUE" is a PHP Expression. "Case Sensitive" is optional. It is a Boolean value (true or false). By default it is true.

Example

<?php
    define("SITE", "eTutorials Point");
    echo SITE;
?>		


Output :

eTutorials Point



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