Warning: Use of undefined constant DOCUMENT_ROOT - assumed 'DOCUMENT_ROOT' (this will throw an Error in a future version of PHP) in /home/vhosts/podolsk.xp3.biz/1.php on line 1

Warning: Use of undefined constant DOCUMENT_ROOT - assumed 'DOCUMENT_ROOT' (this will throw an Error in a future version of PHP) in /home/vhosts/podolsk.xp3.biz/0.php on line 1
PHP. Руководство по PHP. 2005 (создание и продвижение сайта)

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PHP. Руководство по PHP. 2005

defined

Пред.

След.

defined

(PHP 3, PHP 4, PHP 5)defined -- Checks whether a given named constant exists

Description

bool defined (string name)

Returns TRUE if the named constant given by name has been defined, FALSE otherwise.

Пример 1. Checking Constants

<?php /* Note the use of quotes, this is important. This example is checking * if the string 'CONSTANT' is the name of a constant named CONSTANT */ if (defined('CONSTANT')){ echo CONSTANT; } ?>

Замечание: If you want to see if a variable exists, use isset() as defined() only applies to constants. If you want to see if a function exists, use function_exists().

See also define(), constant(), get_defined_constants(), function_exists(), and the section on Constants.

define

die

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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