Error message

• Warning: preg_match(): Unknown modifier '2' in os_check() (line 252 of /var/www/custom/tools/tools.inc).
• Warning: preg_match(): Unknown modifier 'T' in os_check() (line 252 of /var/www/custom/tools/tools.inc).
• Warning: Trying to access array offset on value of type null in display_nasa_curiosity() (line 67 of /var/www/custom/fun/nasa_curiosity.php).