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I'm calling http_get_request_headers() in a PHP file on a server running PHP 5. However, I'm getting Fatal error: Call to undefined function http_get_request_headers(). Does anyone know what the problem might be? Does this function not come with plain PHP?

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  • As stated in the php manual, (PECL pecl_http >= 0.10.0) Commented Mar 11, 2009 at 17:36

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No it does not. You need a PECL module for that function to work. But you can use the contents of the $_SERVER variable as stated in this comment on the php site. Alternatively you can use the apache function if this is your web server.

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If you're using version >= 2 of pecl_http you'll need to use the namespace syntax for calling the functions. Check out the version 2 documentation here and example here

Basically \http\Env::getRequestHeader()

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This is a very important point. I followed the instructions in the PHP manual for installing pecl_http, but still the example for http_support() continued to fail. It's because the PHP manual is written for the old version of this module. Unfortunately, the new module has its own documentation, but it isn't very clear.
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That function is part of the PECL extension.

Follow the instructions on this page to install it: http://ar.php.net/manual/en/http.install.php

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Have you read the Installation and Configuration guide for the HTTP classes/functions?

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