Использование:

<img src="<?php current_season() ?>" alt="" />

                        
function current_season() {

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       $icons = array(

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               "spring" => "images/spring.png",

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               "summer" => "images/summer.png",

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               "autumn" => "images/autumn.png",

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               "winter" => "images/winter.png"

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       );

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       $day = date("z");

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

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

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

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

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

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

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       if( $day >= $spring_starts && $day <= $spring_ends ) :

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               $season = "spring";

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       elseif( $day >= $summer_starts && $day <= $summer_ends ) :

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               $season = "summer";

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       elseif( $day >= $autumn_starts && $day <= $autumn_ends ) :

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               $season = "autumn";

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       else :

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               $season = "winter";

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       endif;

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       $image_path = $icons[$season];

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       echo $image_path;

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}