(PHP 4, PHP 5, PHP 7)
getallheaders — Fetch all HTTP request headers
Fetches all HTTP headers from the current request.
This function is an alias for apache_request_headers(). Please read the apache_request_headers() documentation for more information on how this function works.
   An associative array of all the HTTP headers in the current request, or
   FALSE on failure.
  
| Version | Description | 
|---|---|
| 5.5.7 | This function became available in the CLI server. | 
| 5.4.0 | This function became available under FastCGI. Previously, it was supported when PHP was installed as an Apache module or by the NSAPI server module in Netscape/iPlanet/SunONE webservers. | 
Example #1 getallheaders() example
<?php
foreach (getallheaders() as $name => $value) {
    echo "$name: $value\n";
}
?>