WordPress Netlify Build Hook

netlify.php

<?php

// Somewhere off in your wp-config.php make sure you replace 123456 with your api key.
define( 'NETLIFY_API_KEY', '123456' );

// Somewhere off in your theme or even a plugin.

/** 
* Netlify Webhook Build Function
*
* This function will trigger a rebuild on post update
*
* @param int $post_id ID of post which may or may not deploy Netlify.
*/
add_action( 'save_post', 'fm_netlify_webhook_build' );

if ( ! function_exists( 'fm_netlify_webhook_build' ) ) {
    function fm_netlify_webhook_build( $post_id ) {
        // Exit out on post revisions.
        if ( wp_is_post_revision( $post_id ) ) {
            return;
        }
        
        // If you haven't make sure you define your Netlify api key!
        if ( ! defined( 'NETLIFY_API_KEY' ) {
            write_log( 'Your Netlify API Key is not defined homie!' );

            return false;
        }
        
        $post_status =  get_post_status( $post_id );

        if ( 'publish' === $post_status || 'draft' === $post_status ) {
            
            $api_key = NETLIFY_API_KEY;

            $netlify_hook = "https://api.netlify.com/build_hooks/{$api_key}";

            $response = wp_safe_remote_post( $netlify_hook, array(
                    'headers' => array( 'Content-Type: application/x-www-form-urlencoded' ),
                    'body'    => '{}',
                )
            );

            if ( is_wp_error( $response ) ) {

               $error_message = $response->get_error_message();
                
                /**
                 * Log Errors
                 * You'll need to have the following defined in your wp-config.php: 
                 * define( 'WP_DEBUG', true );
                 * define( 'WP_DEBUG_DISPLAY', false );
                 * define( 'WP_DEBUG_LOG', true );
                 */
                write_log( $error_message );

            }

        }
    }
}
            
// Thanks Elegant Themes!
// @see https://www.elegantthemes.com/blog/tips-tricks/using-the-wordpress-debug-log
if ( ! function_exists('write_log')) {
   function write_log ( $log )  {
      if ( is_array( $log ) || is_object( $log ) ) {
         error_log( print_r( $log, true ) );
      } else {
         error_log( $log );
      }
   }
}

No worries! 👍

Latest version adds error handling if you don't have an api key or if you receive an error from Netlify's api.