How can I enable the MySQLi extension in PHP 7?

The problem is that the package that used to connect PHP to MySQL is deprecated (php5-mysql). If you install the new package,

sudo apt-get install php-mysql

this will automatically update Apache and PHP 7.

I got the solution. I am able to enable MySQLi extension in php.ini. I just uncommented this line in php.ini:

extension=php_mysqli.dll

Now MySQLi is working well. Here is the php.ini file path in an Apache 2, PHP 7, and Ubuntu 14.04 environment:

/etc/php/7.0/apache2/php.ini

By default, the MySQLi extension is disabled in PHP 7.

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