How to Change Graphics Based on Season using PHP?

<?php function current_season() { // Locate the icons $icons = array( “spring” => “images/spring.png”, “summer” => “images/summer.png”, “autumn” => “images/autumn.png”, “winter” => “images/winter.png” ); // What is today’s date – number $day = date(“z”); // Days of spring $spring_starts = date(“z”, strtotime(“March 21”)); $spring_ends = date(“z”, strtotime(“June 20”)); // Days of summer $summer_starts = date(“z”, strtotime(“June 21”)); $summer_ends = date(“z”, strtotime(“September 22”)); // Days of autumn $autumn_starts = date(“z”, strtotime(“September 23”)); $autumn_ends = date(“z”, strtotime(“December 20”)); // If $day is between the days of spring, summer, autumn, and winter if( $day >= $spring_starts && $day <= $spring_ends ) : $season = “spring”; elseif( $day >= $summer_starts && $day <= $summer_ends ) : $season = “summer”; elseif( $day >= $autumn_starts && $day <= $autumn_ends ) : $season = “autumn”; else : $season = “winter”; endif; $image_path = $icons[$season]; echo $image_path; } ?>