mixing php and javascript

Is there a way to mix php and javascript?

I have the query

<?php  $ep = $wpdb->get_results("
	        SELECT post_episode, key1.ID
		FROM $wpdb->posts key1
		INNER JOIN $wpdb->term_relationships key2
            		on key1.ID = key2.object_id
		WHERE key2.term_taxonomy_id = $categoryID
			AND key1.post_status = 'publish'
			AND key1.post_type = 'post'
			AND key1.post_season = $thisSeason
		ORDER BY post_episode ASC"); ?>

I want to be able to change the variable “$thisSeason” through a javascript function. or add a javascript vaiable there that may change from a function.

For the life of me I can’t think of a possible solution.