Misc. Функции
PHP Manual

constant

(PHP 4 >= 4.0.4, PHP 5)

constantReturns the value of a constant

Описание

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.

Список параметров

name

The constant name.

Возвращаемые значения

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

Ошибки

An E_WARNING level error is generated if the constant is not defined.

Примеры

Пример #1 constant() example

<?php

define
("MAXSIZE"100);

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


interface bar {
    const 
test 'foobar!';
}

class 
foo {
    const 
test 'foobar!';
}

$const 'test';

var_dump(constant('bar::'$const)); // string(7) "foobar!"
var_dump(constant('foo::'$const)); // string(7) "foobar!"

?>

Смотрите также


Misc. Функции
PHP Manual