AjaXplorer is a mature and pretty well supported web files explorer, with plugins for various authentications and backends: http://www.ajaxplorer.info/
with some instructions for CentOS here: http://www.argeo.org/mediawiki/index.php/AjaXplorer#How_To_Install_on_RHEL.2...
Note especially:
<Directory /usr/local/share/ajaxplorer> php_value error_reporting 2 </Directory>