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constant
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constant

(PHP 4 >= 4.0.4, PHP 5)

constant -- Returns the value of a constant

Description

mixed constant ( string name )

Return the value of the constant indicated by name.

constant() is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function.

This function works also with class constants.

Parameters

name

The constant name.

Return Values

Returns the value of the constant, or NULL if the constant is not defined.

Examples

Example 1. constant() example

<?php

define("MAXSIZE", 100);

echo MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous line

?>

See Also

define()
defined()
The section on Constants

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