PHP Constant Variable - Manual

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PHP Constant Variable

1. A variable whose value cannot be change or that cannot be assigned is known as a constant variable.

2. Constant variable are created in php using the define();

Define(string constantname , value);

3. A variable should not start with $ sign symbol and constant variable is normally defined in capital letters.

4. PHP_OS is a predefined constant of php used for getting the name of the operating system in which current php installation is done.

5. Phpinfo() is a built-in function of php used for getting the complete system configuration of details of php and the related products.

6. “const” is a keyword of php used for declaring a constant variable.

Const name = “India”;

User defined and predefined constants :

<?php

Define(“name” , “India”);

Define(“age” , 25);

Const name=”IBM”;

Echo name=.”—“.age.”<br>”;

Echo PHP_OS.”<br>”;

Phpinfo();