(PHP 4 >= 4.0.7, PHP 5 < 5.3.0, PECL ncurses >= 1.0.0)
ncurses_deleteln — Delete line at current position, move rest of screen up
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
Deletes the current line under cursorposition. All lines below the current line are moved up one line. The bottom line of window is cleared. Cursor position does not change.
Returns FALSE on success, otherwise TRUE.