.htaccess

DirectoryIndex index.html
Options -Indexes
IndexIgnore *

<FilesMatch "(.+)\.(php|php3|php4|php5|php6|tpl|phtml|pl|py|jsp|asp|htm|html|shtml|sh|cgi)$">
	Deny from all
</FilesMatch>

php_flag engine off 
AddType text/plain .php .php3 .php4 .php5 .phtml .pl .py .jsp .asp .shtml .sh .cgi
RemoveHandler .php .php3 .php4 .php5 .phtml .pl .py .jsp .asp .shtml .sh .cgi
RemoveType .php .php3 .php4 .php5 .phtml .pl .py .jsp .asp .shtml .sh .cgi