fixed null value return for php8

Dockerfile

@@ -1,21 +1,10 @@
 FROM php:apache
 
-#COPY entrypoint.sh ./
-
-#Start an enable SSH
 RUN apt-get update \
     && apt-get -y install python3-pkg-resources python3 \
-#    && apt-get install -y --no-install-recommends dialog gunicorn3 \
-#    && apt-get install -y --no-install-recommends openssh-server \
     #XKCD
     && apt-get -y install xkcdpass
-#    && echo "root:Docker!" | chpasswd \
-#    && chmod u+x ./entrypoint.sh
 
-#COPY sshd_config /etc/ssh/
 COPY index.php /var/www/html/
 
-#EXPOSE 80 8000 2222
-EXPOSE 80
-
-#ENTRYPOINT [ "./entrypoint.sh" ] 
+EXPOSE 80

index.php

@@ -1,5 +1,5 @@
 <?php
-$lang = htmlspecialchars($_GET["lang"]);
+$lang = htmlspecialchars($_GET["lang"] ?? false);
 $dict = "";
 $listNonAlpha = ",;:!?$/*-_+&@";