try installing sybase
sudo apt-get install freetds-common freetds-bin unixodbc php5-sybase
restart your web server.
I had a similar setup as you and this helped me.
Depending on your php version you may want php7.0-sybase
instead of the php5 version
You may get more help from this page https://davejamesmiller.com/blog/connecting-php-to-microsoft-sql-server-on-linux
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