PHP define() Function
PHP Misc Reference
Example
Define a case-sensitive constant:
<?php
define("GREETING","Hello you! How are you today?");
echo constant("GREETING");
?>
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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");
?>
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