I have to pass an array from a php file to python file but my code is giving output NULL

Question

PHP code:

<?php
$data = array('1','4','67','34');

$result = shell_exec('C:/Python27/python C:/xampp/htdocs/123.py ' . escapeshellarg(json_encode($data)));

$resultData = json_decode($result, true);

var_dump($resultData);


?>

Python Code:

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 = {'23','4'}

# Send it to stdout (to PHP)
print json.dumps(result)

Fyi, to pass larger amounts of data using stdin/stdout is much more appropriate than commandline arguments. — ThiefMaster
– ThiefMaster, Commented Jul 2, 2013 at 12:21
Can you narrow down where the failure is: PHP->Python, or Python->PHP? — Barmar
– Barmar, Commented Jul 2, 2013 at 12:21
@ThiefMaster can u tell me how to use stdin/stdout plus why it is giving NULL here is my question — abcdxx
– abcdxx, Commented Jul 2, 2013 at 12:23
the problem is that data in python script is coming out to be null.. can anyone fix that?? — abcdxx
– abcdxx, Commented Jul 2, 2013 at 13:19

furas · Accepted Answer · 2013-12-11 06:47:16Z

1

There is incorrect data for json.dump() in Python

# Generate some data to send to PHP
result = {'23','4'}

So this give error, not json string

import sys, json

# Generate some data to send to PHP
result = {'23','4'}

# Send it to stdout (to PHP)
print json.dumps(result)

and PHP get NULL as $result from Python so you get NULL on screen - in browser

Use (for example):

# Generate some data to send to PHP
result = {'a':'23','b':'4'}

and json.dump() will work fine.

edited Dec 11, 2013 at 6:47

answered Jul 2, 2013 at 14:45

furas

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2 Comments

furas Over a year ago

@MichaelMallett In OP code I found only problem with json returned by Python. Python has problem with json.dump({'23','4'}) so it returns empty string, so PHP gives result NULL (on the screen - in browser). And OP asked for NULL problem. I tested it on computer with Linux Mint, Python 2.7.x, WWW server Apache 2.2.x, PHP 5.3.x. Did you found another explanation ?

b_dubb Over a year ago

are you using shell_exec() to run the python script in php? that will return null if there's a problem finding/executing the python script

antonigiske · Accepted Answer · 2014-10-09 13:28:30Z

1

Add 2>&1 (stdout & stderr) behind the command like so:

$result = shell_exec('C:/Python27/python C:/xampp/htdocs/123.py ' . escapeshellarg(json_encode($data)) . ' 2>&1');

answered Oct 9, 2014 at 13:28

antonigiske

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