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GNU Readline
Руководство по PHP
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CXIV. GNU Readline
Введение

- The readline() functions implement an interface
to the GNU Readline library. These are functions that provide
editable command lines. An example being the way Bash allows you
to use the arrow keys to insert characters or scroll through
command history. Because of the interactive nature of this
library, it will be of little use for writing Web applications,
but may be useful when writing scripts used from a
command line.

Замечание: Для Windows-платформ
это расширение недоступно.
Требования

- To use the readline functions, you need to install libreadline. You can
find libreadline on the home page of the GNU Readline project, at
http://cnswww.cns.cwru.edu/~chet/readline/rltop.html.
It's maintained by Chet Ramey, who's also the author of Bash.
- You can also use these functions with the libedit library, a non-GPL
replacement for the readline library. The libedit library is BSD
licensed and available for download from
http://sourceforge.net/projects/libedit/.
Установка

- To use these functions you must compile the CGI or CLI version of PHP
with readline support. You need to configure PHP
--with-readline[=DIR].
In order you want to use the libedit readline replacement, configure PHP
--with-libedit[=DIR].
Настройка во время выполнения

Данное расширение не определяет никакие директивы конфигурации в php.ini.
Типы ресурсов

Данное расширение не определяет никакие типы ресурсов.
Предопределенные константы

Данное расширение не определяет никакие константы.
Содержание
readline_add_history -- Adds a line to the history
readline_callback_handler_install -- Initializes the readline callback interface and terminal, prints the prompt and returns immediately
readline_callback_handler_remove -- Removes a previously installed callback handler and restores terminal settings
readline_callback_read_char -- Reads a character and informs the readline callback interface when a line is received
readline_clear_history -- Clears the history
readline_completion_function -- Registers a completion function
readline_info -- Gets/sets various internal readline variables
readline_list_history -- Lists the history
readline_on_new_line --
Inform readline that the cursor has moved to a new line
readline_read_history -- Reads the history
readline_redisplay --
Ask readline to redraw the display
readline_write_history -- Writes the history
readline -- Reads a line

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readline_add_history 22222