constant

(PHP 4 >= 4.0.4, PHP 5)

constant -- Returns the value of a constant

Beskrivelse

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.

Parameterliste

name

The constant name.

Returneringsværdier

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

Eksempler

Eksempel 1. constant() example

<?php

define
("MAXSIZE", 100);

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

?>

Se også

define()
defined()
The section on Constants