I am organizing PHP Project files in following way. I don’t know this is standard or not. But it makes my life easier. If anyone knows any standard for organizing PHP files please share with us.

/webroot
/image (all images)
/dev (scripts and images under development – this is a mess)
/doc (document and pdf files that is uploaded or my work description)
/etc (configuration, i.e. database un&pw, etc – restricted perms)
/home (this is where most of the website lives)
/inc (included files)
/func (included functions)
/class (included class)
index.php