AllowOverride Directive
Description: Types of directives that are allowed in .htaccess files
When the server finds an .htaccess file (as specified by AccessFileName), it needs to know which directives declared in that file can override earlier configuration directives.
When this directive is set to None and AllowOverrideList is set to None, .htaccess files are completely ignored. In this case, the server will not even attempt to read .htaccess files in the filesystem.
When this directive is set to All, then any directive which has the .htaccess Context is allowed in .htaccess files.
Order Deny,Allow
he Order directive determines the order in which your rules are processed. With Order deny,allow the deny list will be processed first then the allow list.
With Apache, all rules are processed with the last one matching being the effective rule.
So in this case, your last rule would be allow from all.
AcceptPathInfo
This directive controls whether requests that contain trailing pathname information that follows an actual filename (or non-existent file in an existing directory) will be accepted or rejected. The trailing pathname information can be made available to scripts in the PATH_INFO environment variable.
For example, assume the location /test/ points to a directory that contains only the single file here.html. Then requests for /test/here.html/more and /test/nothere.html/more both collect /more as PATH_INFO.
Apache文档
http://httpd.apache.org/docs/2.4/mod/core.html#acceptpathinfo