Readline only reads the window size on startup or on SIGWINCH. This means if the window is resized when not in a readline() call, the next call will have odd behavior due to confusion about the window size.
The work-around is to force Readline to re-read the window size by sending it SIGWINCH. This is accomplished using the async interface, which installs the signal handler but returns control to PHP.
The following function is a drop-in replacement for readline(), but re-reads the window size every time:
<?
function xreadline($prompt)
{
global $xreadline, $xreadline_line;
$code = '$GLOBALS["xreadline"] = false;' .
'$GLOBALS["xreadline_line"] = $line;' .
'readline_callback_handler_remove();';
$cb = create_function('$line', $code);
readline_callback_handler_install($prompt, $cb);
$signal = defined("SIGWINCH") ? SIGWINCH : 28;
posix_kill(posix_getpid(), $signal);
$xreadline = true;
while ($xreadline)
readline_callback_read_char();
return is_null($xreadline_line) ? false : $xreadline_line;
}
?>
