function dozent_get_courses_by_instructor( $instructor = null, $args = [] ) {
		global $wpdb;

		$default_per_page = dozent_show_per_page();
		$current_page     = (int) dozent_input_text( 'current_page' );
		$page             = max( 1, $current_page );
		$start            = ( $page - 1 ) * $default_per_page;

		$defaults = apply_filters( 'dozent_get_courses_by_instructor_default_args', [
			'not_in_ids'  => [],
			'start'       => $start,
			'per_page'    => $default_per_page,
			'course_status' => [ 'publish' ],
		] );

		$r = wp_parse_args( $args, $defaults );
		extract( $r, EXTR_SKIP );

		$instructor_sql = "";
		if ( ! empty( $instructor ) ) {
			$instructor = new WP_User( $instructor );

			if ( empty( $instructor->ID ) ){
				return new DozentDBResponse();
			}

			$instructor_sql = " AND instructor_courses.instructor_id = {$instructor->ID} ";
		}

		$not_in_ids_query = '';
		if ( ! empty( $not_in_ids ) && dozent_count( $not_in_ids ) ) {
			$not_in_ids_string = implode( ",", $not_in_ids );
			$not_in_ids_query  = " AND courses.ID NOT IN( $not_in_ids_string ) ";
		}

		/**
		 * In Course status SQL
		 */
		$in_sql       = "";
		if ( ! empty( $course_status ) ) {
			$where_in_sql = dozent_array_to_in_sql( $course_status );
			if ( $where_in_sql ) {
				$in_sql = " AND courses.post_status IN($where_in_sql) ";
			}
		}

		$limit_query = '';
		if ( $per_page !== '-1' ) {
			$limit_query = " LIMIT {$start}, {$per_page}  ";
		}

		$course_count = (int) $wpdb->get_var( "SELECT COUNT(courses.ID) 
		FROM {$wpdb->dozent_instructor_courses} instructor_courses
		INNER JOIN {$wpdb->posts} courses ON instructor_courses.course_id = courses.ID
		WHERE 1 = 1 {$instructor_sql} {$in_sql} $not_in_ids_query ;" );

		$course_results = $wpdb->get_results( "SELECT courses.*, instructor_courses.ID as instructor_courses_table_id
		FROM {$wpdb->dozent_instructor_courses} instructor_courses
		INNER JOIN {$wpdb->posts} courses ON instructor_courses.course_id = courses.ID
		WHERE 1 = 1 {$instructor_sql} {$in_sql} $not_in_ids_query ORDER BY instructor_courses.ID DESC {$limit_query} ;" );

		$response = new DozentDBResponse();
		$response->count = $course_count;
		$response->results = $course_results;

		/**
		 * Filter the return of dozent_get_courses_by_instructor() function
		 *
		 * @since Dozent LMS v.1.0.0
		 *
		 * @param DozentDBResponse $response Query Results with
		 * @param object|mixed $instructor Instructor
		 */

		return apply_filters( 'dozent_get_courses_by_instructor', $response, $instructor );
	}