How to run a Bash script via PHP and match the output?

My Bash script:

#!/usr/bin/expect

spawn ssh -L10000:localhost:80 root@192.168.1.10
expect "password:" {send "password\r"}
interact

I need to match if the tunnel SSH is up, something like this:

spawn ssh -L10000:localhost:80 root@192.168.1.10
ssh: connect to host 192.168.1.10 port 22: No route to host -> if exist "No route to host" echo -> "the host is not reachable"

elseif -> output is equal to "Last login: Sun Dec 25 14:50:49 2016 from 192.168.1.90
[root@test ~]# " echo -> "the tunnel ssh is up"