php man page for readline_info

READLINE_INFO(3)							 1							  READLINE_INFO(3)

readline_info - Gets/sets various internal readline variables

SYNOPSIS
       mixed readline_info ([string  $varname], [string  $newvalue])

DESCRIPTION
	Gets or sets various internal readline variables.

PARAMETERS
	      o $varname
		- A variable name.

	      o $newvalue
		- If provided, this will be the new value of the setting.

RETURN VALUES
	If  called with no parameters, this function returns an array of values for all the setting readline uses. The elements will be indexed by
       the following values: done, end, erase_empty_line, library_version, line_buffer, mark, pending_input,  point,  prompt,  readline_name,  and
       terminal_name.

	If called with one or two parameters, the old value is returned.

PHP Documentation Group 													  READLINE_INFO(3)