file - How does PHP scandir work? -

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i need scan directory /home/user/www/site/public_html/application (full path root).
scandir perform 'application' part of full path argument , that's going ok, got list of files , directories result.
interesting how scandir work path 'application'? ain't argument should full path root?
did not found explanation behavior on official php.net, unfortunately.
idea, how works? thanks.

p.s. document_root set /home/user/www/site/public_html

for relative paths bases them on script's current working directory, can find getcwd.


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