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How to use php defined function
- 藏色散人Original
- 2019-05-27 09:30:144118browse
php defined function is used to check whether a certain constant exists. Its syntax is defined(name). The parameter name is required and refers to the name of the constant to be checked.
#How to use php defined function?
Definition and usage
defined() function checks whether a constant exists.
Syntax
defined(name)
Parameters
name Required. Specifies the name of the constant to be checked.
Return value: TRUE if the constant exists, otherwise FALSE.
PHP Version: 4
Example
Check whether a constant exists:
<?php
define("GREETING","Hello you! How are you today?");
echo defined("GREETING");
?>Output:
1
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