'Wordpress with mysqli

My system is: freebsd 10.3 apache24 php5.6 mysql Ver 14.14 Distrib 5.6.30 WordPress 4.6.1 My site on WP works perfectly, but when I install extension php56-mysqli-5.6.28 (for another project), it gives me error on main page:

Invalid query: No database selected Whole query: SELECT count(*) AS 'count' FROM wp_posts WHERE post_type = 'dc_headfoot';

So when I disable mysqli in File /usr/local/etc/php/ext-20-mysqli.ini: 

#extension=mysqli.so

My site works perfectly again. What am I doing wrong? How do I fix this problem? I need mysqli and Wordpress at the same time.

Thank you!

phpmysqlwordpressmysqli


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