php - Wordpress console call to undefined function

Question

I want to implement code on this link https://www.wpexplorer.com/wordpress-featured-image-url/

But when I try to run my code I get this error

PHP Fatal error: Call to undefined function wp_generate_attachment_metadata() in eval()'d code on line 48

File with this function included

// Include image.php
require_once(ABSPATH . 'wp-admin/includes/image.php');

// Define attachment metadata
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );

and when I try to run

function_exists('wp_generate_attachment_metadata');

it returns true, but when I try to use it it shows me error.

question from:https://stackoverflow.com/questions/65886396/wordpress-console-call-to-undefined-function

Answer 1

Waitting for answers