无法从PHP运行Python脚本并将打印输出到浏览器

Question

I've seen a lot of other people running into a similar problem where they can't run Python scripts from PHP. I'm having the same situation, but I have tried all of the solutions that people recommended, but still no luck. I also have a fresh system install and have made my scripts as simple as possible. Regardless of what I do, shell_exec() returns NULL.

So here is how to replicate my issue:

1. Boot up a t2.micro EC2 server on Amazon AWS
2. Configure it as a web server ( instructions here )
3. Upload an index.php file to /var/www/html with the following code:

---

<?php 
$command = escapeshellcmd('sudo /usr/bin/python '.__DIR__.'/script.py');
$output = shell_exec($command);
exit(var_dump($output));

4. Upload a script.py file to the same directory with the following code:

---

#!/usr/bin/python

print('Hello!')

5. Go to the AWS public URL. The response you will get is "NULL"

So to try to solve this issue, I also changed the user group of the .py file to "apache" and I ran chmod +x on the .py file. I confirmed that ec2-user AND apache are in the sudo group. Still no luck! So what haven't I tried? What am I missing or where can I go looking for error logs?

Answer 1

Using the file constant __FILE__ to determine the path to your pyhton script only works, if you apply the dirname function to it - otherwhise you would get something like /var/www/html/script.php/script.py , but you actually want only /var/www/html/script.py .

There are two simple solutions. Use dirname or directly the __DIR__ constant.

$command = escapeshellcmd('sudo /usr/bin/python ' . __DIR__ . '/script.py');

or

$command = escapeshellcmd('sudo /usr/bin/python ' . dirname(__FILE__) . '/script.py');