如何配置XAMPP以远程连接MySQL

Question

I have a problem to connect my online MySQL database from my local system.

I installed XAMPP on my Windows 7 and created a PHP file with this code:

<?php
    $db_path = mysqli_connect('printcity24.com', 'printci1_admin', 'xr10s20191', 'printci1_db', '3306');
    if(!$db_path) {
        echo mysqli_connect_error();
    }else{
        echo "Connected successfully";
    }
?>

Then i created a database on my website : www.printcity24.com

My web host admin configured my host and opened firewall.

When i use XAMPP command line to connect to my database every thing is ok, i can connect to my database remotely with this code :

# mysql -u printci1_admin -p -h printcity24.com

but when i use php code to connect to my database i get this error :

 Warning: mysqli_connect(): MySQL server has gone away in D:\Xampp Server\htdocs\st\index.php on line 2

Warning: mysqli_connect(): (HY000/2006): MySQL server has gone away in D:\Xampp Server\htdocs\st\index.php on line 2
MySQL server has gone away

I upload my php code on to other websites and test for connection and everything is "ok" but on my local xampp can't connect.

In this link said i have to use this command :

setsebool -P httpd_can_network_connect=1 

but I don't know where to put this code and how to configure my xampp.