PHP HTTP Introduction
PHP的HTTP介绍

The HTTP functions let you manipulate information sent to the browser by the Web server, before any other output has been sent.
本类函数可以以低至 HTTP 协议的级别来操纵发回远端浏览器的输出。

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Installation
安装

The directory functions are part of the PHP core. There is no installation needed to use these functions.
本函数库作为 PHP 内核的一部分，不用安装就能使用。

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PHP HTTP Functions
PHP的HTTP函数

PHP: indicates the earliest version of PHP that supports the function.
PHP：最早支持这些函数的PHP版本

Function 函数	Description 说明	PHP
header()	Sends a raw HTTP header to a client 发送一个原始 HTTP 标头	3
headers_list()	Returns a list of response headers sent (or ready to send) 返回已发送（或准备发送）的响应标头的列表	5
headers_sent()	Checks if / where the HTTP headers have been sent 检查标头是否已被发送以及在哪里被发送	3
setcookie()	Sends an HTTP cookie to a client 发送一个 cookie 信息到客户端	3
setrawcookie()	Sends an HTTP cookie without URL encoding the cookie value 发送一个其值未经过url编码的cookie	5

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PHP HTTP Constants
PHP HTTP常量

None.无

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