I created a custom php file, put it in my folder. The files does insert some data to the database to a custom table i created.

require wp_path() . "/wp-load.php";
global $wpdb;
$favorite_table = $wpdb->prefix . "fav";
$wpdb->insert( $favorite_table, array( 'link' => $_POST['fav_link'], 'title'=> $_POST['title']) );
$lastid = $wpdb->insert_id;

echo $lastid;
function wp_path() {
    if (strstr($_SERVER["SCRIPT_FILENAME"], "/wp-content/")) {
        return preg_replace("/\/wp-content\/.*/", "", $_SERVER["SCRIPT_FILENAME"]);
    return preg_replace("/\/[^\/]+?\/themes\/.*/", "", $_SERVER["SCRIPT_FILENAME"]);

what is calling this php file is a jquery ajax function from within my theme:

$.post(WPURLS.theme_directory_uri+'/favorite/fav.php', data).done(function(data ) {
 }).fail(function() {      

This insert into the database but doesn't return anything in the response, data is blank. while if i manually pasted the URL in browser (GET) i can see the $lastid displayed.

What am I doing wrong? I need to retrieve the response data $lastid.

1 Answer 1


You are going on the wrong way.This will create difficulties and is NOT WORDPRESS STANDARD.Wordpress has a ajax technique to implement this.

Call the ajax from your page

var data = {
    'action': 'insert_data_customtable',
    'first_name': firstname,
    'last_name': lastname

// since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php                 
  type: "POST",
  url: ajaxurl,
  dataType: "json",
  data: data,
  success: function(response) {
    ///response will return that you echo in function insert_data_customtable

  error: function(response){


And write this in your functions.php

add_action("wp_ajax_nopriv_insert_data_customtable", "insert_data_customtable");
dd_action("wp_ajax_insert_data_customtable", "insert_data_customtable");

function insert_data_customtable(){
    //Here is your code for insert into table

    echo json_encode($insertid);
  • but url:ajaxurl alone will not point to the php function that is inserting to my table. My url is: WPURLS.theme_directory_uri+'/favorite/fav.php' , i need to reach fav.php
    – ccot
    Mar 18, 2015 at 14:19
  • nevermind I didn't notice the 'action:method_name' part. Thanks man that was very helpful!
    – ccot
    Mar 18, 2015 at 14:36
  • Great ! As you find it useful Mar 19, 2015 at 16:10

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