when I change url from $z_server = 'http://127.0.0.1/zabbix'; to = 'http://127.0.0.1/';
I see that

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Zabbix 3.4 + php 7.2 works

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Have you checked #5 for js/css being loaded properly?

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In this case it was't help
For the test you can create Dockerfile
##############
FROM zabbix/zabbix-appliance:ubuntu-4.2-latest
WORKDIR /usr/share/zabbix
RUN apt-get update -y
RUN apt-get install git -y
RUN apt-get install php-curl php-json -y
RUN git clone https://github.com/martinm76/zabbix-pdf-report.git
RUN cd zabbix-pdf-report && sh fixrights.sh && mv config.inc.php.dist config.inc.php
RUN sed -i 's/https:\/\/YourServerHere\/zabbix/http:\/\/localhost/' /usr/share/zabbix/zabbix-pdf-report/config.inc.php
RUN sed -i 's/YourPasswordHere/zabbix/' /usr/share/zabbix/zabbix-pdf-report/config.inc.php
EXPOSE 80

#####################

then

docker build -t zabbix_4.2 .
docker run --name zabbix -p 80:80 -d zabbix_4.2

go to browser

http://localhost/zabbix-pdf-report/

#For do some changes on container
docker exec -it zabbix /bin/bash

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i have a problem, don't login ,somebody have same problem?

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Please try the new v1.2.0 - Not sure why, but cURL debugging was active in index.php, chooser.php and createpdf.php, which is now disabled by default, as well as updates to javascript includes and various other minor fixes.

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