Operation of PHP Data path

Operation of PHP file path
$url = ' http://' $_server[' Http_host '].substr ($REQUEST _uri,0,strrpos ($REQUEST _uri, '/'));
echo $url;
echo "

";
Echo Strrpos ($REQUEST _uri, '/');
Echo substr ($REQUEST _uri,0,strrpos ($REQUEST _uri, '/'));
echo dirname ($_server[' script_filename ');
echo "

";
echo $_server[' php_self '];
echo "

";
echo $_server[' Script_name '];
echo "

";
echo $db =$_server[' Document_root ']. ' /access/db.mdb ';
echo "

";
echo Realpath ("");
echo "

";
echo $_server[' Document_root '];
echo "

";
echo "

";
echo $_server[' Document_root ']. "
";?? Get the server document root
echo $_server[' php_self ']. "
"; Get the absolute path to the file server executing the code
echo __file__. "
"; Get file system absolute path to files
echo dirname (__file__); Get the folder path where the file is located


Results
Http://localhost/test

F:/kuikoo/test

/test/url.php

/test/url.php

F:/kuikoo/access/db.mdb

F:\kuikoo\test

F:/kuikoo

?

F:/kuikoo
/test/url.php
F:\kuikoo\test\url.php
F:\kuikoo\test

?

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