php - How does this mod_rewrite code resolve properly? -

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my .htaccess file follows:

options -multiviews rewriteengine on rewritecond %{http_host} ^example.com rewriterule ^(.*)$ http://www.example.com/$1 [r=301,l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule ^(.*)$ $1.php

it works, i'm wondering how works. example, if type in example.com/main, file @ www.example.com/main.php. how .php extension if code tells rewriting stop after adding www. beginning of example.com?

edit: or should create unique id purpose of logging in remembered user?

the particular behavior you're asking comes because rule

rewriterule ^(.*)$ http://www.example.com/$1 [r=301,l]

is 301 redirect; instructs browser initiate new http request. l causes (can cause) last rule executed that request; new request comes in correct hostname , proceeds onward.


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