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PHP getallheaders() | Get All Headers
The PHP getallheaders() function is used when we need to fetch all HTTP request headers. For example:
<?php $headers = getallheaders(); foreach ($headers as $key => $value) { echo "$key: $value"; echo "<BR>"; } ?>
The output of above PHP example on getallheaders() function, is:
That is:
Host: localhost Connection: keep-alive Cache-Control: max-age=0 sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="100", "Google Chrome";v="100" sec-ch-ua-mobile: ?0 sec-ch-ua-platform: "Windows" Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Sec-Fetch-Site: none Sec-Fetch-Mode: navigate Sec-Fetch-User: ?1 Sec-Fetch-Dest: document Accept-Encoding: gzip, deflate, br Accept-Language: en-US,en;q=0.9 Cookie: foo=bar
The above example, can also be written in this way:
<?php foreach(getallheaders() as $key => $value) echo "<b>", $key, "</b>: ", $value, "<BR>"; ?>
Now the output should be:
You can also show the information of all HTTP headers, in the form of table, using following PHP script:
<?php echo "<table><tr>"; echo "<th>Name</th>"; echo "<th>Value</th>"; echo "</tr>"; foreach(getallheaders() as $key => $value) { echo "<tr>"; echo "<td>", $key, "</td>"; echo "<td>", $value, "</td>"; echo "</tr>"; } echo "</table>"; ?>
PHP getallheaders() Syntax
The syntax of getallheaders() function in PHP, is:
getallheaders()
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