(PHP 4 >= 4.0.7, PHP 5, PECL ncurses >= 1.0.0)
ncurses_deleteln — Delete line at current position, move rest of screen up
本函数是实验性的。本函数的行为，包括函数名称以及其它任何关于本函数的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。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.