PHP defined() Function
 Complete PHP Misc Reference
Definition and Usage
The defined() function checks whether a constant exists.
Returns TRUE if the constant exists, or FALSE otherwise.
Syntax
| Parameter |
Description |
| name |
Required. Specifies the name of the constant to check |
Example
<?php
define("GREETING","Hello you! How are you today?");
echo defined("GREETING");
?>
|
The output of the code above will be:
Complete PHP Misc Reference
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