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PHP define() Function

< PHP Misc Reference

Example

Define a case-sensitive constant:

<?php
define("GREETING","Hello you! How are you today?");
echo constant("GREETING");
?>

Definition and Usage

The define() function defines a constant.

Constants are much like variables, except for the following differences:

A constant's value cannot be changed after it is set
Constant names do not need a leading dollar sign ($)
Constants can be accessed regardless of scope
Constant values can only be strings and numbers

Syntax

define(name,value,case_insensitive)

Parameter	Description
name	Required. Specifies the name of the constant
value	Required. Specifies the value of the constant
case_insensitive	Optional. Specifies whether the constant name should be case-insensitive. Possible values: TRUE - Case-insensitive FALSE - Default. Case-sensitive

Technical Details

Return Value:	Returns TRUE on success or FALSE on failure
PHP Version:	4+

More Examples

Example 1

Define a case-insensitive constant:

<?php
define("GREETING","Hello you! How are you today?",TRUE);
echo constant("greeting");
?>

< PHP Misc Reference