Пробуем отключить от functions.php: перенос рассчёта зодиака в класс.

classes/User.php

@@ -150,7 +150,7 @@ EMPTY_SLOT;
         echo sprintf('<img src="/i/shadow/%s" alt="%s">', $this->shadow, $this->login);
         echo '</div><!-- slot-image -->';
         echo '<div class="user-signs">';
-        echo sprintf('<img src="i/zodiac/%s.png" alt="Родовой знак">', star_sign($this->borndate));
+        echo sprintf('<img src="i/zodiac/%s.png" alt="Родовой знак">', $this->showStarSign());
         echo '</div><!-- user-signs -->';
         echo '<div class="user-info">';
         echo '<div class="stats-container">';
@@ -179,4 +179,44 @@ EMPTY_SLOT;
         echo '</div><!-- user-info-container-lower -->';
     }
 
+    public function showStarSign() {
+     /*
+      * 1 aries
+      * 2 taurus
+      * 3 gemini
+      * 4 cancer
+      * 5 leo
+      * 6 virgo
+      * 7 libra
+      * 8 scorpio
+      * 9 sagittarios
+      * 10 capricorn
+      * 11 aquarius
+      * 12 pisches
+     */
+        $zodiac[356] = "10";
+        $zodiac[326] = "09";
+        $zodiac[296] = "08";
+        $zodiac[266] = "07";
+        $zodiac[235] = "06";
+        $zodiac[203] = "05";
+        $zodiac[172] = "04";
+        $zodiac[140] = "03";
+        $zodiac[111] = "02";
+        $zodiac[78] = "01";
+        $zodiac[51] = "12";
+        $zodiac[20] = "11";
+        $zodiac[0] = "10";
+        $dayOfYear = date("z", strtotime($this->borndate));
+        $isLeapYear = date("L", strtotime($this->borndate)); //Высокосный?
+        if ($isLeapYear && $dayOfYear >59) {
+            --$dayOfYear;
+        }
+        foreach ($zodiac as $day => $sign) {
+            if ($dayOfYear > $day) {
+                break;
+            }
+        }
+        return $sign ?? null;
+    }
 }