Description:
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Using php built-in server : php.exe -S 127.0.0.1 -t c:\myWebRoot

if a relative path is used in a sub-folder the server assume the root as beeing that folder (the assumed root should always be the root indicated in the command line, in this case was c:\myWebRoot, this would prevent this strange fails)

took me quite a while to understand why my sites worked ok in IIS, LAMP, WAMP, any Apache server... but failed using php built-in server...

As this built-in server is a excelent and useful resource, 
I urge you to solve this odd behaviour... for versions 5.4.x and 5.6.x





Test script:
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no script, 
this will happen even with a simple HTML static page link <a> from any subfolder
as you click the link (if it has a relative path, for example other html file in the same folder) php-server try to find it in root...

wwwroot
    index.html

    images_folder
        any_image.png

    pages_folder
        page1.html
        page2.html

if you have a link <a> in page1.html that is inside pages_folder
and that link jumps to page2.html
php built-in server will fail to retrive page2.html because is looking for
/page2.html instead of ./page2.html
the problem is that assume the current folder as root to search for relative links