How to Correctly Run Python Script from PHP [duplicate] - php

Question

This question already has answers here:
Running a Python script from PHP
(10 answers)
Closed 7 years ago.
I have a python script that I would like to run from PHP. This is my PHP script:
$data = array('as', 'df', 'gh');
// Execute the python script with the JSON data
$result = shell_exec('python /path/to/myScript.py ' . escapeshellarg(json_encode($data)));
// Decode the result
$resultData = json_decode($result, true);
// This will contain: array('status' => 'Yes!')
var_dump($resultData);
And this is my Python script:
import sys, json
# Load the data that PHP sent us
try:
data = json.loads(sys.argv[1])
except:
print "ERROR"
sys.exit(1)
# Generate some data to send to PHP
result = {'status': 'Yes!'}
# Send it to stdout (to PHP)
print json.dumps(result)
I would like to be able to exchange data between PHP and Python, but the above error gives the output:
ERROR NULL
Where am I going wrong ?
:::::EDIT::::::
I ran this:
$data = array('as', 'df', 'gh');
// Execute the python script with the JSON data
$temp = json_encode($data);
$result= shell_exec('C:\Python27\python.exe test.py ' . "'" . $temp . "'");
echo $result;
I am getting No JSON object could be decoded

Answer 1

On my machine, the code works perfectly fine and displays:
array(1) {
'status' =>
string(4) "Yes!"
}
On the other hand, you may make a few changes to diagnose the issue on your machine.
Check the default version of Python. You can do this by running python from the terminal. If you see something like:
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
you're fine. If you see that you are running Python 3, this could be an issue, since your Python script is written for Python 2. So:
Python 3.4.0 (default, Apr 11 2014, 13:05:11)
[...]
should be a clue.
Again from the terminal, run python myScript.py "[\"as\",\"df\",\"gh\"]". What do you see?
{"status": "Yes!"}
is cool. A different response indicates that the issue is probably with your Python script.
Check permissions. How do you run your PHP script? Do you have access to /path/to/? What about /path/to/myScript.php?
Replace your PHP code by:
<?php
echo file_get_contents("/path/to/myScript.php");
?>
Do you get the actual contents?
Now let's add a few debugging helpers in your PHP code. Since I imagine that you are not using a debugger, the simplest way is to print debug statements. This is OK for 10-LOC scripts, but if you need to deal with larger applications, invest your time in learning how to use PHP debuggers and how do use logging.
Here's the result:
/path/to/demo.php
<?php
$data = array('as', 'df', 'gh');
$pythonScript = "/path/to/myScript.py";
$cmd = array("python", $pythonScript, escapeshellarg(json_encode($data)));
$cmdText = implode(' ', $cmd);
echo "Running command: " . $cmdText . "\n";
$result = shell_exec($cmdText);
echo "Got the following result:\n";
echo $result;
$resultData = json_decode($result, true);
echo "The result was transformed into:\n";
var_dump($resultData);
?>
/path/to/myScript.py
import sys, json
try:
data = json.loads(sys.argv[1])
print json.dumps({'status': 'Yes!'})
except Exception as e:
print str(e)
Now run the script:
cd /path/to
php -f demo.php
This is what I get:
Running command: python /path/to/myScript.py '["as","df","gh"]'
Got the following result:
{"status": "Yes!"}
The result was transformed into:
array(1) {
'status' =>
string(4) "Yes!"
}
yours should be different and contain a hint about what is happening.

Answer 2

I got it to work by adding quotes around the argument!
Like so:
<?php
$data = array('as', 'df', 'gh');
$temp = json_encode($data);
echo shell_exec('python myScript.py ' . "'" . $temp . "'");
?>