Is mysqli extension enabled in this php configuration?

I've a website designed in php with mysqli (mysql - improved) extension. The phpinfo() page shows this:

./configure --disable-fileinfo --disable-phar --enable-bcmath --enable-calendar --enable-ftp --enable-gd-native-ttf --enable-libxml --enable-magic-quotes --enable-mbstring --enable-pdo=shared --enable-soap --enable-sockets --enable-wddx --enable-zend-multibyte --enable-zip --prefix=/usr --with-bz2 --with-curl=/opt/curlssl/ --with-curlwrappers --with-freetype-dir=/usr --with-gd --with-imap=/opt/php_with_imap_client/ --with-imap-ssl=/usr --with-jpeg-dir=/usr --with-kerberos --with-libdir=lib64 --with-libexpat-dir=/usr --with-libxml-dir=/opt/xml2 --with-libxml-dir=/opt/xml2/ --with-mcrypt=/opt/libmcrypt/ --with-mysql=/usr --with-mysql-sock=/var/lib/mysql/mysql.sock --with-mysqli=/usr/bin/mysql_config --with-openssl=/usr --with-openssl-dir=/usr --with-pcre-regex=/opt/pcre --with-pdo-mysql=shared --with-pdo-sqlite=shared --with-pic --with-png-dir=/usr --with-pspell --with-sqlite=shared --with-tidy=/opt/tidy/ --with-xmlrpc --with-xpm-dir=/usr --with-xsl=/opt/xslt/ --with-zlib --with-zlib-dir=/usr

Does this mean that mysqli extension is enabled in this configuration?

Should the mysqli extension be enabled then on the very same phpinfo page a "MysqlI Support | enabled" table header should appear. Look for that:

If you want to find out in a script, look for a function specific for mysqli like mysqli_connect() and than check if it exists:

var_dump(function_exists('mysqli_connect'));

If this outputs FALSE, then it does not exists and it's highly likely that you can not use the module.

It means it was compiled with mysqli support. Whether the module is enabled or not is another question.