Ejecutar el comando Drush desde PHP

<?php
exec('/usr/bin/php /var/www/drush/drush.php site-install --yes --db-url=mysql://USER:PASSWORD@localhost:3306/DATABASE --account-name=DRUPAL_USER --account-pass=DRUPAL_PASSWORD [email protected] --site-name=SiteName');
?>
  
you can also try this also.
  
<?php
  exec('drush site-install --yes --db-url=mysql://USER:PASSWORD@localhost:3306/DATABASE --account-name=DRUPAL_USER --account-pass=DRUPAL_PASSWORD [email protected] --site-name=SiteName');
?>
SECRET MYSTERY