Load plugin class in functions.php

Question

I am using wordpress 4.9.8 and PHP 7.1.8 I want to load a function from my class.

The plugin class is located under:

C:\\Users\\admin\\Desktop\\wordpress\\wp-content\\plugins\\content-creator\\includes\\SinglePostContent.php

My function.php file is with the following folder:

C:\\Users\\admin\\Desktop\\wordpress\\wp-content\\themes\\rehub-blankchild\\functions.php

The function I would like to load looks like the following:

class SinglePostContent
{

    public function __construct()
    {
        //...
    }

    public function main($postID)
    {
      //...
    }

I tried to use the

add_action('wp_ajax_updateContent', 'updateContent');
function updateContent()
{

    $post_id = intval($_POST['post_id']);

    try {
        SinglePostContent::main($post_id); // HERE I get the error!
    } catch (Exception $e) {
        echo $e;
    }
    wp_die();

}

Any suggestion how to load the class SinglePostContent within my function.php

Answer 1

You are accessing the method as static which is not. You need to instantiate the class and then call the method like this:

add_action('wp_ajax_updateContent', 'updateContent');

function updateContent(){

    $post_id = 1;
    $single_post_content = new SinglePostContent;
    try {

        $single_post_content->main( $post_id );  
    } catch ( Exception $e ) {
        echo $e;
    }
    wp_die();
}