在XAMPP / CentOS 7上安装php-mssql

Question

I want to connect to a Microsoft SQL Server with my Xampp Server (CentOS 7).

I ran the following commands:

yum install -y epel-release
yum install php-mssql
service xampp restart

When I call mssql_connect('192.168.0.1, 1433', 'user', '***'); in my PHP file it throws the following error:

Fatal error: Call to undefined function mssql_connect() in /opt/lampp/htdocs/index.php on line 39

What am I doing wrong?