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Referência da Linguagem
PHP Manual

Constantes

Índice

Uma constante é um identificador (nome) para um único valor. Como o nome sugere, esse valor não pode mudar durante a execução do script (exceção às constantes mágicas, que não são constantes de verdade). As constantes são sensíveis ao caso por padrão. Por convenção, o nomes de constantes são sempre em maiúsculas.

O nome de uma constante tem as mesmas regras de qualquer identificador no PHP. Um nome de constante válida começa com uma letra ou sublinhado, seguido por qualquer número de letras, números ou sublinhados. Em expressões regulares, ela pode ser representada por: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*

Dica

Veja também o Guia de nomenclatura em espaço de usuário.

Exemplo #1 Nomes de constantes válidos e inválidos

<?php

// Nomes de constantes válidos
define("FOO",     "alguma coisa");
define("FOO2",    "alguma outra coisa");
define("FOO_BAR""alguma coisa mais");

// Nomes de constantes inválidas
define("2FOO",    "alguma coisa");

// Isto é válido, mas deve ser evitado:
// O PHP pode vir a fornercer uma constante mágica
// que danificará seu script
define("__FOO__""alguma coisa");

?>

Nota: Para nossos exemplos, as letras a-z, A-Z e os caracteres ASCII do 127 ao 255 (0x7f-0xff).

Como as superglobals, o escopo de uma constante é global. Você pode acessar constantes de qualquer lugar em seu script sem se preocupar com o escopo. Para mais informações sobre o escopo no PHP, leia a seção do manual escopo de variáveis.


Referência da Linguagem
PHP Manual

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