Call header of wordpress project theme in a template page created in custom plugin in wordpress

Question

My plugin main file(Plugin.php)
The display page which I have made is inside this plugin only named as shopdetail.php and in that i have included

<?php
/*
  Plugin Name: Coupon  
  Version: 1.0.0
  Author: Akash Rai
  Description: This plugin is for Coupon Management
*/
session_start();
ob_start();
include_once dirname(__FILE__) . '/includes/coupon_shortcodes.php';
function coupon_plugin()
{
    require_once(ABSPATH . 'wp-admin/includes/upgrade.php');		
}
$url = $_SERVER['REQUEST_URI'];
$product = substr($url,19);
if($url == "/preview/cash-back/$product" && $url != "/preview/cash-back/")
{
        load_template( dirname( __FILE__ ) . '\includes\templates\shopdetail.php');
        exit();
}
register_activation_hook( __FILE__, 'coupon_plugin' );

When I run the page it says:-

Fatal error: Call to a member function get() on null in C:\xampp\htdocs\preview\wp-includes\query.php on line 28
I have created a custom plugin and in that plugin I have created a custom php page in which I am showing my description coming from database, but the problem is when I use get_header(); function then it does not display header of the main theme which I have implemented in project. Can anyone help me with it, I am little bit newbei

Have you looked at the file that it's pointing you to at line 28? — Lee
Yes i looked but i think it is not the actual thing which is causing the problem, check my latest code update which I just did — Business Development

Lee Lee · Accepted Answer · 2015-02-20T11:32:43

At the start of your plugin code try adding

global $wp_query;

If it still does the same error, underneath it add

var_dump($wp_query)

If that is returning as null, then for some reason your plugin isn't accessing wp_query, which is what is needed for get() I believe.

Call header of wordpress project theme in a template page created in custom plugin in wordpress

1 Answers