PHP7.x install mysql extension

• mysql extension download
  http://git.php.net/?p=pecl/database/mysql.git;a=summary

• Initialize with phpize tool
  sudo /usr/local/bin/phpize

  error message

  Cannot find autoconf. Please check your autoconf installation and the
$PHP_AUTOCONF environment variable. Then, rerun this script.

  solution:
  sudo yum install -y m4 autoconf

• compile mysql extension
  sudo ./configure --with-php-config=/usr/local/bin/php-config --with-mysql=mysqlnd

  sudo make && sudo make install