Python script won't exec from php when specific library is used

问题

Im trying to execute a Python script to get and set the parameter server in ROS. When I run any other simple python script that for example prints "Hello", I get back the value in PHP. But when I run this code:

 #!/usr/bin/env python
 import roslib
 import rospy
 import sys
 import re
 import string

 get = rospy.get_param("param")
 print get

I get an empty echo. However this code works fine in the terminal!

All I'm doing in PHP is:

 $output = exec("python path/script.py")
 echo $output;

I tried shell_exec, I tried with python in the command, and without. I also tried /usr/bin/python still it won't work for this specific code, but everything works for a simple print!

回答1:

It turns out that Apache's user doesnt have the required environment variables. So you have to add the environment variables paths you need in Apache's.. You can set them out here

来源：https://stackoverflow.com/questions/34918981/python-script-wont-exec-from-php-when-specific-library-is-used