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Superglobais — Superglobais são variáveis nativas que estão sempre disponíveis em todos escopos
Várias variáveis pré-definidas no PHP são "superglobais", que significa que elas estão disponível em todos escopos para todo o script. Não há necessidade de fazer global $variable; para acessá-lo dentro de funções ou métodos.
Estas variáveis superglobais são:
| Versão | Descrição |
|---|---|
| 4.1.0 | Superglobais foram introduzidas no PHP. |
Nota: Disponibilidade da variável
Por padrão, todas as superglobais estão disponíveis, mas há diretivas que afetam esta disponibilidade. Para mais informação, consulte na documentação sobre variables_order.
Nota: Lidando com register_globals
Se a obsoleta diretiva register_globals é definida para on então variáveis contidas irão também estar disponíveis no escopo global do script. Por exemplo, $_POST['foo'] também existiria como $foo.
Para informação relacionada, veja o FAQ intitulado "Como register_globals pode afetar?"
Nota: Variável variáveis
Superglobais não podem ser usadas como variável variáveis dentro de função ou métodos de classes.
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