Wordpress function to get Post ID from slug

get_post_id_by_slug.php

function get_post_id_by_slug( $post_name, $post_type = 'post' ) {
    global $wpdb;

    // Prepare the SQL query to retrieve the post ID by post_name and post_type
    $query = $wpdb->prepare( "
        SELECT ID 
        FROM $wpdb->posts 
        WHERE post_name = %s 
        AND post_type = %s 
        AND post_status = 'publish'
    ", $post_name, $post_type );

    // Execute the query and get the post ID
    $post_id = $wpdb->get_var( $query );

    // Return the post ID (or null if no post was found)
    return $post_id ? (int) $post_id : null;
}

Uses a simple SQL query to get the ID instead of relying on "get_page_by_path" which returns the whole WP_POST OBJECT.
Accepts one parameter ("post_type")