blocks|key|1412719|text|您应该可以在$_SERVER全局变量中找到所有HTTP头，前缀为HTTP_+uppercased，并用破折号(-)替换为下划线(_)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1412720|例如，您的X-Requested-With可以在以下位置找到：|1412721|$_SERVER['HTTP_X_REQUESTED_WITH']|code-block|syntax|javascript|1412722|从$_SERVER变量创建关联数组可能比较方便。这可以通过几种样式来完成，但这里有一个输出驼峰键值的函数：|1412723|$headers+=+array();
foreach+($_SERVER+as+$key+=>+$value)+{
++++if+(strpos($key,+'HTTP_')+===+0)+{
++++++++$headers[str_replace('+',+'',+ucwords(str_replace('_',+'+',+strtolower(substr($key,+5)))))]+=+$value;
++++}
}|1412724|现在只需使用$headers['XRequestedWith']来检索所需的标头。|1412725|$_SERVER上的PHP手册：http://php.net/manual/en/reserved.variables.server.php|1412726|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/reserved.variables.server.php^0|6|8|W|5|0|5|G|0|0|1|8|0|0|6|Q|0|0|8|G|1I|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1E|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1I|8|@$9|1J|A|1K|B|C]]|D|@$9|1L|A|1M|1|1N]]|E|$]]|$1|U|3|-4|5|6|7|1O|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

You should find all HTTP headers in the <code>$_SERVER</code> global variable prefixed with <code>HTTP_</code> uppercased and with dashes (-) replaced by underscores (_).

For instance your <code>X-Requested-With</code> can be found in:

<pre><code>$_SERVER['HTTP_X_REQUESTED_WITH']
</code></pre>

It might be convenient to create an associative array from the <code>$_SERVER</code> variable. This can be done in several styles, but here's a function that outputs camelcased keys:

<pre><code>$headers = array();
foreach ($_SERVER as $key =&gt; $value) {
 if (strpos($key, 'HTTP_') === 0) {
 $headers[str_replace(' ', '', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))))] = $value;
 }
}
</code></pre>

Now just use <code>$headers['XRequestedWith']</code> to retrieve the desired header.

PHP manual on <code>$_SERVER</code>: <a href="http://php.net/manual/en/reserved.variables.server.php" rel="noreferrer">http://php.net/manual/en/reserved.variables.server.php</a>

blocks|key|1627423|text|从PHP5.4.0开始，您可以使用getallheaders函数，该函数以关联数组的形式返回所有请求头：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1627424|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)+[...]"
//+}|code-block|syntax|javascript|1627425|早些时候，此函数仅在PHP作为Apache/NSAPI模块运行时才起作用。|1627426|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/function.getallheaders.php^0|H|D|H|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Since PHP 5.4.0 you can use <a href="http://php.net/manual/en/function.getallheaders.php" rel="noreferrer"><code>getallheaders</code></a> function which returns all request headers as an associative array:

<pre><code>var_dump(getallheaders());

// array(8) {
//   ["Accept"]=&gt;
//   string(63) "text/html[...]"
//   ["Accept-Charset"]=&gt;
//   string(31) "ISSO-8859-1[...]"
//   ["Accept-Encoding"]=&gt;
//   string(17) "gzip,deflate,sdch"
//   ["Accept-Language"]=&gt;
//   string(14) "en-US,en;q=0.8"
//   ["Cache-Control"]=&gt;
//   string(9) "max-age=0"
//   ["Connection"]=&gt;
//   string(10) "keep-alive"
//   ["Host"]=&gt;
//   string(9) "localhost"
//   ["User-Agent"]=&gt;
//   string(108) "Mozilla/5.0 (Windows NT 6.1; WOW64) [...]"
// }
</code></pre>

Earlier this function worked only when PHP was running as an Apache/NSAPI module.

blocks|key|1413004|text|我使用的是CodeIgniter，并使用下面的代码来获取它。可能对将来的某些人有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1413005|$this->input->get_request_header('X-Requested-With');|code-block|syntax|javascript|1413006|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I was using CodeIgniter and used the code below to get it. May be useful for someone in future.

<pre><code>$this-&gt;input-&gt;get_request_header('X-Requested-With');
</code></pre>

blocks|key|1412839|text|为了让事情变得简单，下面是你如何得到你想要的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1412840|简单：|1412841|$headerValue+=+$_SERVER['HTTP_X_REQUESTED_WITH'];|code-block|syntax|javascript|1412842|或者当您需要一次获取一个时：|1412843|<?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.
$header_x_requested_with+=+get_header(+'X-Requested-With'+);|1412844|其他标头也在超级全局数组$_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|offset|length|1412845|entityMap|0|LINK|mutability|MUTABLE|url|http://php.net/manual/en/reserved.variables.server.php^0|0|0|0|0|0|16|1I|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

To make things simple, here is how you can get just the one you want:

Simple:

<pre><code>$headerValue = $_SERVER['HTTP_X_REQUESTED_WITH'];
</code></pre>

or when you need to get one at a time:

<pre><code>&lt;?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' );
</code></pre>

The other headers are also in the super global array $_SERVER, you can read about how to get at them here: <a href="http://php.net/manual/en/reserved.variables.server.php" rel="nofollow">http://php.net/manual/en/reserved.variables.server.php</a>

blocks|key|1627694|text|如果只需要检索一个密钥，例如需要"Host"地址，那么我们可以使用|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1627695|apache_request_headers()['Host']|code-block|syntax|javascript|1627696|这样我们就可以避免循环，并将其内联到回声输出|1627697|entityMap^0|G|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

if only one key is required to retrieved, For example <code>"Host"</code> address is required, then we can use 

<pre><code>apache_request_headers()['Host']
</code></pre>

So that we can avoid loops and put it inline to the echo outputs

blocks|key|1412889|text|我是这样做的。如果没有传递$header_name，则需要获取所有的headers：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1412890|<?php
function+getHeaders($header_name=null)
{
++++$keys=array_keys($_SERVER);

++++if(is_null($header_name))+{
++++++++++++$headers=preg_grep("/%5EHTTP_(.*)/si",+$keys);
++++}+else+{
++++++++++++$header_name_safe=str_replace("-",+"_",+strtoupper(preg_quote($header_name)));
++++++++++++$headers=preg_grep("/%5EHTTP_${header_name_safe}$/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");
?>|code-block|syntax|javascript|1412891|在我看来，它比其他答案中给出的大多数例子简单得多。这也获得了方法(GET/POST/等)。以及获取所有头文件时所请求的URI，如果您试图在日志记录中使用它，这将非常有用。|1412892|下面是输出：|1412893|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%2Bxml,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|1412894|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Here's how I'm doing it. You need to get all headers if $header_name isn't passed:

<pre><code>&lt;?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");
?&gt;
</code></pre>

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.

Here's the output:

<pre><code>Array ( [HOST] =&gt; 127.0.0.1 [USER_AGENT] =&gt; Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:28.0) Gecko/20100101 Firefox/28.0 [ACCEPT] =&gt; text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 [ACCEPT_LANGUAGE] =&gt; en-US,en;q=0.5 [ACCEPT_ENCODING] =&gt; gzip, deflate [COOKIE] =&gt; PHPSESSID=MySessionCookieHere [CONNECTION] =&gt; keep-alive )

en-US,en;q=0.5
</code></pre>

blocks|key|1413109|text|PHP+7:空合并运算符|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1413110|//$http+=+'SCRIPT_NAME';
$http+=+'X_REQUESTED_WITH';
$http+=+strtoupper($http);
$header+=+$_SERVER['HTTP_'.$http]+??+$_SERVER[$http]+??+NULL;

if(is_null($header)){
++++die($http.+'+Not+Found');
}
echo+$header;|code-block|syntax|javascript|1413111|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

PHP 7: Null Coalesce Operator

<pre><code>//$http = 'SCRIPT_NAME';
$http = 'X_REQUESTED_WITH';
$http = strtoupper($http);
$header = $_SERVER['HTTP_'.$http] ?? $_SERVER[$http] ?? NULL;

if(is_null($header)){
 die($http. ' Not Found');
}
echo $header;
</code></pre>

blocks|key|1412778|text|这里有一个简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1412779|//+echo+get_header('X-Requested-With');
function+get_header($field)+{
++++$headers+=+headers_list();
++++foreach+($headers+as+$header)+{
++++++++list($key,+$value)+=+preg_split('/:\s*/',+$header);
++++++++if+($key+==+$field)
++++++++++++return+$value;
++++}
}|code-block|syntax|javascript|1412780|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Here is an easy way to do it.

<pre><code>// echo get_header('X-Requested-With');
function get_header($field) {
 $headers = headers_list();
 foreach ($headers as $header) {
 list($key, $value) = preg_split('/:\s*/', $header);
 if ($key == $field)
 return $value;
 }
}
</code></pre>

blocks|key|1627575|text|下面这段PHP代码对您很有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1627576|<?php
foreach($_SERVER+as+$key+=>+$value){
echo+'$_SERVER["'.$key.'"]+=+'.$value."<br+/>";
}
?>|code-block|syntax|javascript|1627577|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This small PHP snippet can be helpful to you:

<pre><code>&lt;?php
foreach($_SERVER as $key =&gt; $value){
echo '$_SERVER["'.$key.'"] = '.$value."&lt;br /&gt;";
}
?&gt;
</code></pre>

blocks|key|1627608|text|function+getCustomHeaders()
{
++++$headers+=+array();
++++foreach($_SERVER+as+$key+=>+$value)
++++{
++++++++if(preg_match("/%5EHTTP_X_/",+$key))
++++++++++++$headers[$key]+=+$value;
++++}
++++return+$headers;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1627609|我使用此函数来获取自定义标头，如果标头从"HTTP_X_“开始，我们将其推入数组:)|unstyled|1627610|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>function getCustomHeaders()
{
 $headers = array();
 foreach($_SERVER as $key =&gt; $value)
 {
 if(preg_match("/^HTTP_X_/", $key))
 $headers[$key] = $value;
 }
 return $headers;
}
</code></pre>

I use this function to get the custom headers, if the header starts from "HTTP_X_" we push in the array :)

blocks|key|1627669|text|如果您有Apache服务器，则可以执行此操作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1627670|PHP代码：|1627671|$headers+=+apache_request_headers();

foreach+($headers+as+$header+=>+$value)+{
++++echo+"$header:+$value+<br+/>\n";
}|code-block|syntax|javascript|1627672|结果：|1627673|Accept:+*/*
Accept-Language:+en-us
Accept-Encoding:+gzip,+deflate
User-Agent:+Mozilla/4.0
Host:+www.example.com
Connection:+Keep-Alive|1627674|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This work if you have an Apache server

PHP Code:

<pre><code>$headers = apache_request_headers();

foreach ($headers as $header =&gt; $value) {
 echo "$header: $value &lt;br /&gt;\n";
}
</code></pre>

Result:

<pre><code>Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0
Host: www.example.com
Connection: Keep-Alive
</code></pre>

How should I read any header in PHP?

For example the custom header: <code>X-Requested-With</code>.

How do I read any request header in PHP

服务器

Windows

Ubuntu

Linux

我应该如何读取PHP中的任何头文件？例如，自定义标题：X-Requested-With。

问如何在PHP中读取任何请求头
EN

回答 11

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问如何在PHP中读取任何请求头EN

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问如何在PHP中读取任何请求头
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