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reserved functions ,
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$_ENV -- $HTTP_ENV_VARS [obsoleta] — Environment variables
Um array associativo de variáveis passadas para o script atual via o método do ambiente.
Estas variáveis são importadas para o PHP do ambiente sob o qual o parser do PHP é executado. Muitas são providas pelo shell sob o qual o PHP é executado e diferentes sistemas são prováveis executar diferentes tipos de shells, uma lista definitiva é impossível. Veja a documentação de shellp para saber a lista de variáveis de ambiente definidas.
Outras variáveis de ambiente incluem variáveis CGI, elas aparecem desconsiderando se o PHP é executado como um módulo do servidor ou processador CGI.
$HTTP_ENV_VARS contém a mesma informação inicial, mas não é uma superglobal. (Note que $HTTP_ENV_VARS e $_ENV são variáveis diferentes e que o PHP manuseia-as diferentemente)
| Versão | Descrição |
|---|---|
| 4.1.0 | Introduzida a $_ENV que torna obsoleta a $HTTP_ENV_VARS. |
Exemplo #1 Exemplo da $_ENV
<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>
Assumindo que "bjori" executou este script
O exemplo acima irá imprimir algo similar a:
My username is bjori!
Nota: Esta é uma 'superglobal', ou global automática, variável. Isto simplismente significa que ela está disponível em todos escopos pelo script. Não há necessidade de fazer global $variable; para acessá-la dentro de uma função ou método.
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