Wordpress Plugin Dev : Fatal error: Call to undefined function add_action()

admin · Oct 10, 2022

I'm new on plugin development.

I'm try to create a custom Printable form page in wp-admin to create Customer Postal Address.

very Similar <a href="https://wordpress.org/plugins/woocommerce-order-address-print/" rel="nofollow noreferrer">This plugin</a>

when administrator click on "print Address" link , pop-up

Code:

template.php

page with customer address and information for print address

<a href="

https://imgur.com/tkfTB

" rel="nofollow noreferrer"><img src="

https://imgur.com/tkfTB

" alt="enter image description here"></a>

The Problem is :

I get fatal Error when click on print order anchor tag and i can't run any

Code:

wordpress

action on

Code:

template.php

:

Fatal error: Call to undefined function add_action() in C:\xampp\htdocs\wp-content\plugins\address generator\template.php on line 4

Code:

 &lt;?php
    /**
    * Plugin Name: Address Generator
    * Plugin URI: http://CGTV.ir
    * Description:Generate Postal Label for Parcel
    * Version: 1.0 or 
    * Author: Hamed Mayahian
    * Author URI: CGTV.ir
    * License: A "Slug" license name e.g. GPL12
    */
    // ADDING COLUMN TITLES (Here 2 columns)
    /*define( 'MY_PLUGIN_PATH', plugin_dir_path( __FILE__ ) );
    include( MY_PLUGIN_PATH . 'template.php');
    */      

      require_once(ADDRESS__PLUGIN_DIR .'template.php');




    add_filter( 'manage_edit-shop_order_columns', 'custom_shop_order_column',11);
    function custom_shop_order_column($columns)
    {
       //add columns
        $columns['my-column1'] = __( 'چاپ آدرس','theme_slug');
       return $columns;

    }

    // adding the data for each orders by column (example)
    add_action( 'manage_shop_order_posts_custom_column' , 'cbsp_credit_details', 10, 2 );
    function cbsp_credit_details( $column )
    {
        global $post, $woocommerce, $the_order;
        $order_id = $the_order-&gt;id;

        switch ( $column )
        {
            case 'my-column1' :
                $myVarOne = wc_get_order_item_meta( $order_id, '_the_meta_key1', true );
                echo $myVarOne;
                echo "&lt;a target='_blank' href='".plugins_url( 'template.php' , __FILE__ )."?order=$order_id'&gt;Print Address&lt;/a&gt;";
                break;


        }
    }

Template.php

Code:

&lt;?php


add_action('init', 'my_init', 1);
function my_init(){

    global $post, $woocommerce, $the_order;

    $id = $_GET['order'];
    $order = new WC_Order($id);
    $address    = $order-&gt;get_billing_address();

    $customer_id = get_current_user_id();
if($_GET['order'] == "") {
  // no username entered
  echo "آدرس پیدا نشد";
} else {
  echo "Hello, " . $address;
}

}
?&gt;

Wordpress Plugin Dev : Fatal error: Call to undefined function add_action()

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