LifterLMS Course redirect to first incomplete lesson

llms-course-continue-redirect.php

<?php // Do not copy this line

// Copy from under this line and paste into your child theme's functions.php

add_action( 'template_redirect', 'lifterlms_course_continue_redirect' );


if ( ! function_exists( 'lifterlms_course_continue_redirect' ) ) {
	
	function lifterlms_course_continue_redirect( $post_id = null, $student = null, $progress = null ) {
		if ( ! $post_id ) {
			$post_id = get_the_ID();
			if ( ! $post_id ) {
				return '';
			}
		}
		
		$course = llms_get_post( $post_id );
		
		if ( ! $course || ! is_a( $course, 'LLMS_Post_Model' ) ) {
			return '';
		}
		if ( $course->get( 'type' ) != 'course' ) {
			return '';
		}
		if ( ! $student ) {
			$student = llms_get_student();
		}
		if ( ! $student || ! $student->exists() || ! llms_is_user_enrolled( $student->get_id(), $course->get( 'id' ) ) ) {
			return '';
		}
		if ( is_null( $progress ) ) {
			$progress = $student->get_progress( $course->get( 'id' ), 'course' );
		}
		if ( 100 == $progress ) {
			return '';
		} else {
			$lesson = $student->get_next_lesson( $course->get( 'id' ) );
			if ( $lesson ) {
				wp_safe_redirect( get_permalink( $lesson ) );
				exit();
			}
		}
	}
}// End if().