Discuss the use of particle systems in creating special effects in CGI motion.

<?php $maxDate = date("2025-01-01"); $result ="SELECT * FROM courses WHERE status='active' and STR_TO_DATE(date1_from,'%m/%d/%Y') >= CURDATE()"; $result4 ="SELECT * FROM courses WHERE status='active' and STR_TO_DATE(date4_from,'%m/%d/%Y') >= CURDATE()"; $result5 ="SELECT * FROM courses WHERE status='active' and STR_TO_DATE(date5_from,'%m/%d/%Y') >= CURDATE()"; $result2 ="SELECT * FROM courses WHERE....