WordPress Ajax Call — WordPress User ID

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I am working on a WordPress based site, which I am new to. Basically, we are using a plugin to track “points” on the site, and I am using a call to get the user’s wordpress ID for the games. However, the issue is that when I make an ajax call it returns 0 (aka not logged in) for the user ID, but when I visit the PHP page directly it gives me the actual user ID (example: 9). Here is the plugin function that I call in my PHP file: 

function cp_currentUser() {

require_once(ABSPATH . WPINC . '/pluggable.php');
global $current_user;
get_currentuserinfo();
return $current_user->ID;

}

and then here is my PHP file

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<?php

header("Access-Control-Allow-Origin: *");

require_once("wp-load.php");

echo cp_currentUser();

?>

and here is my cross-domain AJAX call 

$.post('http://my.domain.xz/cp_getbalance.php', {}, function(result){

console.log(result);

});

If you go directly to the above URL in your browser while logged in it will give you the user id, but if I attempt it from the AJAX call I just get 0 no matter who I am logged in as.

Post Views: 4

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4 comments

  1. Your approach is wrong from my point of view.

    You cannot get information from a cookie (client-side) on a piece of data that it processes on the server (server-side).

    What you need to do is:

    • Recover the current_user-> ID before the POST call in AJAX

    • Send the retrieved ID in POST

    • Process the data via server retrieved via $ _POST variable.

    An example.

    Your PHP file:

    header("Access-Control-Allow-Origin: *");

require_once("wp-load.php");

echo $_POST['user_id'];

    Your cross-domain AJAX call:

    <?php
require "wp-load.php";
global $current_user:
$user_id = $current_user->ID;
?>
var formData = {
    'user_id': '<?php echo $user_id; ?>'
};
//console.log(formData);

$.ajax({
    url: "http://my.domain.xz/cp_getbalance.php",
    type: "post",
    data: formData,
    success: function(result) {
        console.log(result);
    }
});

    Having said that, in WordPress the AJAX calls are done in a completely different way and I suggest you read this guide to better understand: https://codex.wordpress.org/AJAX_in_Plugins

    I hope to be proved helpful

  2. Try this: wp_get_current_user()

    require_once("wp-load.php");  //Please confirm your wp-load path
$current_user = wp_get_current_user();
echo $current_user->ID;
exit;

  3. You should probably always use wp_die(), whether in an Ajax callback or not. Even better, send information back with wp_send_json() options.

    require_once("wp-load.php");  //Please confirm your wp-load path
$current_user = wp_get_current_user();
echo $current_user->ID;
 wp_die(); // this is required to terminate immediately and return a proper response

  4. The way you work with AJAX in WordPress is a bit wrong.

    First of all you should add extend your function:

    add_action( 'wp_ajax_nopriv_cp_currentUser', 'cp_currentUser' );
function cp_currentUser() {
  $current_user = wp_get_current_user();

  header("Access-Control-Allow-Origin: *");
  header("Access-Control-Allow-Methods: POST");

  echo $current_user->ID;

  wp_die();
}

    Function get_currentuserinfo() deprecated (Codex).

    Second your Ajax function:

    $.ajax({
   url: 'https://my.domain.xz/wp-admin/admin-ajax.php',
   method: 'POST',
   data: { action: 'cp_currentUser' }
}).done( function( response ) {
   console.log( response );
});

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