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The PHP function readline_clear_history() removes the entire command line history, returning TRUE on success and FALSE on failure, providing a simple way to clear stored input lines during interactive sessions and can be used in scripts that require privacy of entered commands.
readline_callback_handler_remove() is a PHP function that removes the previously installed readline callback handler, restores the terminal settings, and returns true if a handler was successfully removed or false otherwise, providing a way to clean up interactive input sessions.
readline_redisplay() is a PHP function that forces the readline interface to redraw the display area, takes no arguments, provides no return value, and is part of the readline extension used to refresh the user’s input line after external changes.
The PHP function readline_read_history() reads command history from a specified file, returning TRUE on success and FALSE on failure, and is used to load previously entered commands into the readline interface.
The article explains the PHP function readline_list_history(), which returns the complete command‑line history as an indexed array, describes its return value, and provides a practical example showing how to print the history using print_r.
The PHP readline_info function retrieves or sets internal readline variables, returning all settings as an array when called without arguments or the previous value when a variable name (and optional new value) is provided, with usage illustrated by a complete code example.
This article explains the PHP readline() function, its purpose for reading a line of user input, the optional prompt parameter, return value details, and provides a complete example demonstrating reading commands, adding them to history, and displaying history and variable information.