If you missed that argument when initially installing php5 and want to add it after the fact, this is all you need:
sudo apt-get install php5-readline
安装
要使用这些函数，必须编译支持 readline 的 PHP 的 CGI 或者 CLI 版本。需要配置 PHP --with-readline[=DIR]。如果想使用 libedit 代替 readline，配置 PHP --with-libedit[=DIR]。
在 Windows 上，此扩展自 PHP 7.1.0 起默认可用。
add a note
User Contributed Notes 2 notes
kevin_tm at yahoo dot com ¶
8 years ago
rs at income dot cz ¶
9 years ago
Use dotdeb. It's like 1 minute work.
Follow https://www.dotdeb.org/instructions/
Do only points 1,3,4 (omit 2)
and then
sudo apt-get install php5-readline
