Description:
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In PHP < 5.2.2 the realpath function would return a string value on a valid path passed to the function. In 5.2.2 it returns false unless a filename is specified.

Going over the documentation it looks like this might be an expected result, but it is different from earlier versions.

Extensions: curl, ldap, mssql, mysql, pdo, pdo_sqlite, pdo_mssql, sqlite, tidy, ssh2

I'm using the php.ini file from my 5.2.1 installation and going over the incompatibilities and changes from 5.2.1 the only change that seems related is this one:

- SplFileObject::getFilename() returns the filename, not relative/path/to/file, as of PHP 5.2.1.

Reproduce code:
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$path1 = 'E:\\webroot\\';
$path2 = 'E:\\webroot\\index.php';

var_dump(realpath($path1));
var_dump(realpath($path2));

Expected result:
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string 'E:\webroot\' (length=11)
string 'E:\webroot\index.php' (length=20)

Actual result:
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boolean false
string 'E:\webroot\index.php' (length=20)