Вие сте на: Константи


Константи:
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Константи - Manual in GERMAN
Константи - Manual in ENGLISH
Константи - Manual in FRENCH
Константи - Manual in POLISH
Константи - Manual in PORTUGUESE

Последни търсения:
language functions , include functions , variable functions , post functions




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Справочник на езика
PHP Manual

Константи

Съдържание

Константата е индентификатор (име) за проста стойност. Както подсказва и името, тази стойност не може да се променя по време на изпълнение на скрипта (с изключение на вълшебните константи, които всъщност не са константи). Константата е чувствителна към регистъра (case-sensitive) по подразбиране. Неписано правило е константните индентификатори да се пишат винаги с главни букви.

Имената на константите следват същите правила като другите етикети в PHP. Валидното име на константа започва с буква или подчертавка, последвана от произволен брой букви, цифри или подчертавки. Като регулярен израз, това би могло да бъде представено така: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*

Съвет

Вж. също Userland Naming Guide.

Example #1 Валидни и невалидни имена на константи

<?php

// Валидни имена на константи
define("FOO",     "нещо");
define("FOO2",    "нещо друго");
define("FOO_BAR""нещо в повече");

// Невалидни имена на константи
define("2FOO",    "нещо");

// Това е валидно, но трябва да се избягва:
// Възможно е някой ден PHP да предостави вълшебна константа,
// която ще счупи скрипта ви
define("__FOO__""нещо"); 

?>

Забележка: В случая, под буква се разбират a-z, A-Z, и ASCII знаците от 127 до 255 (0x7f-0xff).

Както и за superglobals, константата има глобална област на действие. Можете да достъпвате константи където и да е във вашия скрипт без оглед на контекста. За повече информация относно обхват и контекст, прочетете раздел Област на действие на променливи.


Справочник на езика
PHP Manual

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