如何读取 PHP 中的任何请求标头
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How do I read any request header in PHP
提问by Sabya
How should I read any header in PHP?
我应该如何阅读 PHP 中的任何标题？
For example the custom header: X-Requested-With.
例如自定义标头：X-Requested-With.
回答by Quassnoi
$_SERVER['HTTP_X_REQUESTED_WITH']
RFC3875, 4.1.18:
Meta-variables with names beginning with
HTTP_contain values read from the client request header fields, if the protocol used is HTTP. The HTTP header field name is converted to upper case, has all occurrences of-replaced with_and hasHTTP_prepended to give the meta-variable name.
HTTP_如果使用的协议是 HTTP，则名称以 开头的元变量包含从客户端请求标头字段读取的值。HTTP 标头字段名称被转换为大写，所有出现的 都-被替换为_并已HTTP_预先给出元变量名称。
回答by Jacco
IF: you only need a single header, instead of allheaders, the quickest method is:
IF：您只需要一个标题，而不是所有标题，最快的方法是：
<?php
// Replace XXXXXX_XXXX with the name of the header you need in UPPERCASE (and with '-' replaced by '_')
$headerStringValue = $_SERVER['HTTP_XXXXXX_XXXX'];
ELSE IF: you run PHP as an Apache module or, as of PHP 5.4, using FastCGI (simple method):
否则：您将 PHP 作为 Apache 模块运行，或者，从 PHP 5.4 开始，使用 FastCGI（简单方法）：
<?php
$headers = apache_request_headers();
foreach ($headers as $header => $value) {
echo "$header: $value <br />\n";
}
ELSE:In any other case, you can use (userland implementation):
ELSE：在任何其他情况下，您可以使用（用户空间实现）：
<?php
function getRequestHeaders() {
$headers = array();
foreach($_SERVER as $key => $value) {
if (substr($key, 0, 5) <> 'HTTP_') {
continue;
}
$header = str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))));
$headers[$header] = $value;
}
return $headers;
}
$headers = getRequestHeaders();
foreach ($headers as $header => $value) {
echo "$header: $value <br />\n";
}
See Also:
getallheaders()- (PHP >= 5.4) cross platform editionAlias of apache_request_headers()apache_response_headers()- Fetch all HTTP response headers.
headers_list()- Fetch a list of headers to be sent.
另请参阅：
getallheaders()- (PHP >= 5.4)跨平台版本apache_request_headers()apache_response_headers() 的别名- 获取所有 HTTP 响应标头。
headers_list()- 获取要发送的标头列表。
回答by Thomas Jensen
You should find all HTTP headers in the $_SERVERglobal variable prefixed with HTTP_uppercased and with dashes (-) replaced by underscores (_).
您应该在$_SERVER全局变量中找到所有以HTTP_大写字母为前缀的HTTP 标头，并将短划线 (-) 替换为下划线 (_)。
For instance your X-Requested-Withcan be found in:
例如，您X-Requested-With可以在以下位置找到：
$_SERVER['HTTP_X_REQUESTED_WITH']
It might be convenient to create an associative array from the $_SERVERvariable. This can be done in several styles, but here's a function that outputs camelcased keys:
从$_SERVER变量创建关联数组可能会很方便。这可以通过多种方式完成，但这里有一个输出驼峰键的函数：
$headers = array();
foreach ($_SERVER as $key => $value) {
if (strpos($key, 'HTTP_') === 0) {
$headers[str_replace(' ', '', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))))] = $value;
}
}
Now just use $headers['XRequestedWith']to retrieve the desired header.
现在只需用于$headers['XRequestedWith']检索所需的标头。
PHP manual on $_SERVER: http://php.net/manual/en/reserved.variables.server.php
PHP 手册$_SERVER：http: //php.net/manual/en/reserved.variables.server.php
回答by Salman A
Since PHP 5.4.0 you can use getallheadersfunction which returns all request headers as an associative array:
自 PHP 5.4.0 起，您可以使用getallheaders将所有请求标头作为关联数组返回的函数：
var_dump(getallheaders());
// array(8) {
// ? ["Accept"]=>
// ? string(63) "text/html[...]"
// ? ["Accept-Charset"]=>
// ? string(31) "ISSO-8859-1[...]"
// ? ["Accept-Encoding"]=>
// ? string(17) "gzip,deflate,sdch"
// ? ["Accept-Language"]=>
// ? string(14) "en-US,en;q=0.8"
// ? ["Cache-Control"]=>
// ? string(9) "max-age=0"
// ? ["Connection"]=>
// ? string(10) "keep-alive"
// ? ["Host"]=>
// ? string(9) "localhost"
// ? ["User-Agent"]=>
// ? string(108) "Mozilla/5.0 (Windows NT 6.1; WOW64) [...]"
// }
Earlier this function worked only when PHP was running as an Apache/NSAPI module.
早些时候，此功能仅在 PHP 作为 Apache/NSAPI 模块运行时才起作用。
回答by Glenn Plas
strtoloweris lacking in several of the proposed solutions, RFC2616 (HTTP/1.1) defines header fields as case-insensitive entities. The whole thing, not just the valuepart.
strtolower一些提议的解决方案缺乏，RFC2616 (HTTP/1.1) 将标头字段定义为不区分大小写的实体。整个事情，而不仅仅是价值部分。
So suggestions like only parsing HTTP_entries are wrong.
所以像只解析HTTP_条目这样的建议是错误的。
Better would be like this:
最好是这样：
if (!function_exists('getallheaders')) {
foreach ($_SERVER as $name => $value) {
/* RFC2616 (HTTP/1.1) defines header fields as case-insensitive entities. */
if (strtolower(substr($name, 0, 5)) == 'http_') {
$headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
}
}
$this->request_headers = $headers;
} else {
$this->request_headers = getallheaders();
}
Notice the subtle differences with previous suggestions. The function here also works on php-fpm (+nginx).
请注意与先前建议的细微差别。这里的函数也适用于 php-fpm (+nginx)。
回答by Milap Kundalia
Pass a header name to this function to get its value without using forloop. Returns null if header not found.
将标头名称传递给此函数以获取其值，而无需使用for循环。如果未找到标头，则返回 null。
/**
* @var string $headerName case insensitive header name
*
* @return string|null header value or null if not found
*/
function get_header($headerName)
{
$headers = getallheaders();
return isset($headerName) ? $headers[$headerName] : null;
}
Note: this works only with Apache server, see: http://php.net/manual/en/function.getallheaders.php
注意：这仅适用于 Apache 服务器，请参阅：http: //php.net/manual/en/function.getallheaders.php
Note: this function will process and load all of the headers to the memory and it's less performant than a forloop.
注意：此函数将处理所有标头并将其加载到内存中，它的性能不如for循环。
回答by b01
To make things simple, here is how you can get just the one you want:
为简单起见，您可以通过以下方式获得您想要的：
Simple:
简单的：
$headerValue = $_SERVER['HTTP_X_REQUESTED_WITH'];
or when you need to get one at a time:
或者当您需要一次获得一个时：
<?php
/**
* @param $pHeaderKey
* @return mixed
*/
function get_header( $pHeaderKey )
{
// Expanded for clarity.
$headerKey = str_replace('-', '_', $pHeaderKey);
$headerKey = strtoupper($headerKey);
$headerValue = NULL;
// Uncomment the if when you do not want to throw an undefined index error.
// I leave it out because I like my app to tell me when it can't find something I expect.
//if ( array_key_exists($headerKey, $_SERVER) ) {
$headerValue = $_SERVER[ $headerKey ];
//}
return $headerValue;
}
// X-Requested-With mainly used to identify Ajax requests. Most JavaScript frameworks
// send this header with value of XMLHttpRequest, so this will not always be present.
$header_x_requested_with = get_header( 'X-Requested-With' );
The other headers are also in the super global array $_SERVER, you can read about how to get at them here: http://php.net/manual/en/reserved.variables.server.php
其他标头也在超级全局数组 $_SERVER 中，您可以在此处阅读有关如何获取它们的信息：http: //php.net/manual/en/reserved.variables.server.php
回答by Rajesh
I was using CodeIgniter and used the code below to get it. May be useful for someone in future.
我正在使用 CodeIgniter 并使用下面的代码来获取它。将来可能对某人有用。
$this->input->get_request_header('X-Requested-With');
回答by Jonnycake
Here's how I'm doing it. You need to get all headers if $header_name isn't passed:
这就是我的做法。如果 $header_name 未通过，您需要获取所有标题：
<?php
function getHeaders($header_name=null)
{
$keys=array_keys($_SERVER);
if(is_null($header_name)) {
$headers=preg_grep("/^HTTP_(.*)/si", $keys);
} else {
$header_name_safe=str_replace("-", "_", strtoupper(preg_quote($header_name)));
$headers=preg_grep("/^HTTP_${header_name_safe}$/si", $keys);
}
foreach($headers as $header) {
if(is_null($header_name)){
$headervals[substr($header, 5)]=$_SERVER[$header];
} else {
return $_SERVER[$header];
}
}
return $headervals;
}
print_r(getHeaders());
echo "\n\n".getHeaders("Accept-Language");
?>
It looks a lot simpler to me than most of the examples given in other answers. This also gets the method (GET/POST/etc.) and the URI requested when getting all of the headers which can be useful if you're trying to use it in logging.
在我看来，它比其他答案中给出的大多数示例要简单得多。这也会获取方法 (GET/POST/etc.) 和获取所有标头时请求的 URI，如果您尝试在日志记录中使用它，这可能很有用。
Here's the output:
这是输出：
Array ( [HOST] => 127.0.0.1 [USER_AGENT] => Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:28.0) Gecko/20100101 Firefox/28.0 [ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 [ACCEPT_LANGUAGE] => en-US,en;q=0.5 [ACCEPT_ENCODING] => gzip, deflate [COOKIE] => PHPSESSID=MySessionCookieHere [CONNECTION] => keep-alive )
en-US,en;q=0.5
回答by Technolust
This small PHP snippet can be helpful to you:
这个小的 PHP 代码片段可能对您有所帮助：
<?php
foreach($_SERVER as $key => $value){
echo '$_SERVER["'.$key.'"] = '.$value."<br />";
}
?>
