src/Composer/Util/Filesystem.php
public function removeJunction($junction)
    {
        if (!Platform::isWindows()) {
            return false;
        }
        $junction = rtrim(str_replace('/', DIRECTORY_SEPARATOR, $junction), DIRECTORY_SEPARATOR);
        if (!$this->isJunction($junction)) {
            throw new IOException(sprintf('%s is not a junction and thus cannot be removed as one', $junction));
        }

        return $this->rmdir($junction);
    }
public function removeJunction($junction)
    {
        if (!Platform::isWindows()) {
            return false;
        }
        $junction = rtrim(str_replace('/', DIRECTORY_SEPARATOR, $junction), DIRECTORY_SEPARATOR);
        if (!$this->isJunction($junction)) {
            throw new IOException(sprintf('%s is not a junction and thus cannot be removed as one', $junction));
        }

        return $this->rmdir($junction);
    }
Removes a Windows NTFS junction.

@param  string $junction
@return bool