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<?php

function current_season() {
       $icons = array(
               "spring" => "images/spring.png",
               "summer" => "images/summer.png",
               "autumn" => "images/autumn.png",
               "winter" => "images/winter.png"
       );

       $day = date("z");

       $spring_starts = date("z", strtotime("March 21"));
       $spring_ends   = date("z", strtotime("June 20"));

       $summer_starts = date("z", strtotime("June 21"));
       $summer_ends   = date("z", strtotime("September 22"));

       $autumn_starts = date("z", strtotime("September 23"));
       $autumn_ends   = date("z", strtotime("December 20"));

       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;
}

?>