Description:
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From manual page: http://www.php.net/function.is-writable
---

Quote: Returns TRUE if the filename exists and is writable. The filename argument may be a directory name allowing you to check if a directory is writable. 

Well it did not return true in the following test case. The file system is NTFS.

Test script:
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var_dump(is_writeable("C:\\Inetpub\\wwwroot\\simplepiecache"));          // false
var_dump(is_writeable("\\Inetpub\\wwwroot\\simplepiecache"));            // false
var_dump(is_writeable("/Inetpub/wwwroot/simplepiecache"));               // false
var_dump(is_writeable("/Inetpub/wwwroot/simplepiecache/"));              // false

file_put_contents("/Inetpub/wwwroot/mln/simplepiecache/aaa.txt", "bbb"); // DOES create a file aaa.txt containing bbb
echo file_get_contents("/Inetpub/wwwroot/mln/simplepiecache/aaa.txt");   // bbb


Expected result:
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var_dump(is_writeable("C:\\Inetpub\\wwwroot\\simplepiecache")); // should be true
var_dump(is_writeable("\\Inetpub\\wwwroot\\simplepiecache"));   // should be true
var_dump(is_writeable("/Inetpub/wwwroot/simplepiecache"));      // should be true
var_dump(is_writeable("/Inetpub/wwwroot/simplepiecache/"));     // should be true