I consistently get this error on my site:
warning: preg_match() expects parameter 2 to be string, array given in /mnt/www/html/piatrium/docroot/includes/bootstrap.inc on line 858.
I'm hosted on Acquia managed cloud.
Line 858 of that file reads: return (preg_match('/^./us', $text) == 1) ? htmlspecialchars($text, ENT_QUOTES, 'UTF-8') : '';
Any ideas and/or help?
I'm at a loss on how to recreate this for someone else -- this warning appears on every admin screen.