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PHP实现取得HTTP请求的原文_PHP

May 31, 2016 pm 07:30 PM
http php ask

本文实例讲述了PHP实现取得HTTP请求的原文的方法,具体步骤如下:

1. 取得请求行:Method、URI、协议

可以从超级变量$_SERVER中获得,三个变量的值如下:

$_SERVER['REQUEST_METHOD'].' '.$_SERVER['REQUEST_URI'].' '.$_SERVER['SERVER_PROTOCOL']."\r\n"; 

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2. 取得所有Header

PHP有个内置函数getallheader(),是apache_request_headers()函数的一个别名,可以将HTTP请求的所有Header以数组形式返回。但这个函数只能工作在Apache下,如果换了Nginx或者命令行,会直接报函数不存在的错误。

比较通用的方法是,从超级变量$_SERVER中提取出来,有关Header的键值都是“HTTP_”开头的,可以根据此特点取得所有的Header。

具体代码如下:

function get_all_headers() { 
$headers = array(); 

foreach($_SERVER as $key => $value) { 
if(substr($key, 0, 5) === 'HTTP_') { 
$key = substr($key, 5); 
$key = strtolower($key); 
$key = str_replace('_', ' ', $key); 
$key = ucwords($key); 
$key = str_replace(' ', '-', $key); 

$headers[$key] = $value; 
} 
} 

return $headers; 
} 

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3. 取得Body

官方提供了一种获取请求Body的方法,即:

file_get_contents('php://input') 

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4. 最终完整代码如下:

/** 
* 获取HTTP请求原文 
* @return string 
*/ 
function get_http_raw() { 
$raw = ''; 

// (1) 请求行 
$raw .= $_SERVER['REQUEST_METHOD'].' '.$_SERVER['REQUEST_URI'].' '.$_SERVER['SERVER_PROTOCOL']."\r\n"; 

// (2) 请求Headers 
foreach($_SERVER as $key => $value) { 
if(substr($key, 0, 5) === 'HTTP_') { 
$key = substr($key, 5); 
$key = str_replace('_', '-', $key); 

$raw .= $key.': '.$value."\r\n"; 
} 
} 

// (3) 空行 
$raw .= "\r\n"; 

// (4) 请求Body 
$raw .= file_get_contents('php://input'); 

return $raw; 
}

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感兴趣的读者可以调试一下本文所述实例,以加深理解。相信对大家的PHP程序设计有一定的帮助作用。

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