How to use `exec` to execute a command with multiple steps in bash

Question

I have a multi-step command that asks several questions along the way. I need to do it in code.

php command.php
> 你叫什么名字？
User Smith
> 你多大了？
25
> 你已经够大了！

But when I call it with exec it gets stuck.

What I expect is:

<?php

$result = exec('php command.php')->next('User Smith')->next('25');

if ($result->response === '你已经够大了！') echo "Yahoo";
else  echo "哦不！";

Answer 1

We can use the pipe operator to chain commands. We can do something like this:

exec('(echo 'User Smith' & echo '25') | php command.php')

The direction is from right to left.

Pipe multiple commands into a single command