My code is working fine on my localhost in my development environment which is outside of the WordPress press environment. I know the PHP function is working. I am able to send test votes to my server from my localhost on my PC.

Problem: I cannot get this to work in WordPress.

My Thoughts
I think it’s a path issue, but I’ve tried putting the PHP script in the root and using a full path.
I am not getting any errors in the web browser console (f12).

WordPress Version: 5.4.1
I put my custom php code into “/wp-contents/custom-php/votifier.php”
My JQuery script is in the header. (yes, I know I should put it in the footer.)

The Button

<div id="voteButton">
<button type="button">Try it</button>
</div>

Localhost Version

<script>
$(document).ready(function(){
  $("#voteButton").click(function(){
    $.post("votifier/votifier.php",
    {
      key: $.trim($("#field_yjr62").val()),
      ip: $('input[name="item_meta[40]"]').val(),
      port: $('input[name="item_meta[42]"]').val(),
      service: "Votifier",
      username: $('input[name="item_meta[59]"]').val()
    },
    function(data,status){
      alert("Data: " + data + "nStatus: " + status);
    });
  });
});
</script>

WordPress Version

<script>
jQuery(document).ready(function( $ ) {
  jQuery("#voteButton").click(function(){
    $.post("/home/xxxxxxxxxxxx/public_html/wp-content/custom-php/votifier.php",
    {
      key: $.trim($("#field_yjr62").val()),
      ip: $('input[name="item_meta[40]"]').val(),
      port: $('input[name="item_meta[42]"]').val(),
      service: "Votifier",
      username: $('input[name="item_meta[59]"]').val()
    },
    function(data,status){
      alert("Data: " + data + "nStatus: " + status);
    });
  });
});
</script>

My Custom PHP Script

<?php

const VOTE_FORMAT = "VOTEn%sn%sn%sn%dn";
const PUBLIC_KEY_FORMAT = "-----BEGIN PUBLIC KEY-----n%sn-----END PUBLIC KEY-----";

$public_key     = formatPublicKey($_POST['key']);
$server_ip      = $_POST["ip"];
$port           = $_POST["port"];
$service_name   = $_POST["service"];
$username       = $_POST["username"];

sendVote($username, $public_key, $server_ip, $port, $service_name);

function formatPublicKey($public_key) {
    $public_key = wordwrap($public_key, 65, "n", true);
    $public_key = sprintf(PUBLIC_KEY_FORMAT, $public_key);
    return $public_key;
}

function sendVote($username, $public_key, $server_ip, $port, $service_name) {


    if (php_sapi_name() !== 'cli') {
        //Detect proxy and use correct IP.
        $address = isset($_SERVER['HTTP_X_FORWARDED_FOR']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
    } else {
        //Script is run via CLI, use server name.
        $address = $_SERVER['SERVER_NAME'];
    }

    $data = sprintf(VOTE_FORMAT, $service_name, $username, $address, time());
    openssl_public_encrypt($data, $crypted, $public_key);
    $socket = @fsockopen($server_ip, $port);

    if ($socket) {
        if (fwrite($socket, $crypted)) {
            fclose($socket);
            return true;
        }
    }

    return false;
}
?>