Enroll all students into a welcome course when they enroll into any course in LifterLMS

llms-welcome-course-enrollment.php

<?php // Do not copy this line

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

add_action( 'llms_user_enrolled_in_course', 'llms_enroll_in_welcome_course', 10, 2 );

// Uncomment to enroll when user joins a membership

add_action( 'llms_user_added_to_membership_level', 'llms_enroll_in_welcome_course', 10, 2 );

function llms_enroll_in_welcome_course( $student_id, $course_id ){
	
	/* 
	 * the welcome course's id.
	 * You can get this by editing the course and getting the value of the post parameter of the screen's url
	 * https://yoursite.com/wp-admin/post.php?post=123&action=edit
	 */
	$welcome_course_id = 123;
	
	// prevent an inception like scenario and run the remaining code only when student enrolls in any other course
	if( (int) $course_id === (int) $welcome_course_id ){
		return;
	}
	
	// enroll student into the welcome course
	llms_enroll_student( $student_id, $welcome_course_id );
	
}