I want to use some of the Wordpress API built in functions such as wp_remote_request(). I have tried using this in a php file in my root Wordpress installation but I am just getting an error:

Fatal error: Call to undefined function wp_remote_request() in /home/pacekuwa/public_html/gf.php on line 23

I have a feeling I am not putting my code in the right place or need to include one or more Wordpress files...

Could anyone tell me where I should be putting my code?


I am trying to create a page that makes a remote API call to my Gravity Forms plugin to retrieve submitted form entries using the Gravity Forms Web API. I was trying to follow their example, but don't know where the code they give should go within my installation to get it to work.

  • Why you are using WordPress function in a separate file ? – Sumit Feb 19 '16 at 11:30
  • Hi Sumit, can you tell me what file I should put the code in, in my Wordpress installation? – Ben Feb 19 '16 at 14:33
  • It's depends on what you are posting ? Please edit your question and describe what you are trying to do with wp_remote_request – Sumit Feb 19 '16 at 15:24
  • @Sumit - I have added a further explanation to my quiestion. – Ben Feb 19 '16 at 18:24

You can create a plugin to contain your code. The admin_post_ action can be used to trigger a request handler. WordPress core will be loaded, and the API will work.

Plugin Name: Ben's GF Plugin

// for logged-in users
add_action( 'admin_post_ben_gf', 'ben_gf_handle_request' );
// for non logged-in users
add_action( 'admin_post_nopriv_ben_gf', 'ben_gf_handle_request' );

function ben_gf_handle_request() {

    // Your processing code.
    // WordPress functions will work here.
    echo 'Your home url: ' . home_url();

    // die() at the end to terminate execution

This will map your request handler to the URL:


Use caution if you are allowing non-logged in users to access this URL, you don't want to publicly expose sensitive data.

  • Thank you very much, that is a very helpful explanation, and much appreciated. – Ben Feb 20 '16 at 11:01

Wordpress functions are used in theme or plugin files. If you want to use wordpress functions in custom php file you have to include wp-load.php file. require_once("../../../../wp-load.php"); . Number of dots depends where is your custom file.

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