Sending/receiving string from PHP to Python

Question

I'm running two Python scripts from my PHP code. To send the values to the scripts I'm doing:

$output1 = shell_exec('python /path/to/my/script1.py '.$name);
$output1 = explode(',', $output1);

and then I'm doing:

$output2 = shell_exec('python /path/to/my/script2.py '.$output1[0]);
$output2 = explode(',', $output2);

$output1 receives the return from the python script correctly but script2.py is returning me a wrong value. Manually setting that value of $output1[0] directly on script2.py gives me a correct value so the problem is not the script.

I already did a echo var_dump($output1); and it's giving me a correct $output1[0], so the problem is neither the value coming from $output1.

Any clues?

Edit1: the value of $output1[0] is a string with white spaces ("Green Day").

Edit2: seems like it's passing just the word "Green". When I pass a string that has a white space, only the first word is passed. That doesn't make sense since I'm exploding by ',' and when I echo the $output1 it shows me the correct string with the white space included.

Chris · Accepted Answer · 2017-09-17 19:31:08Z

3

I managed to solve the problem so I'll answer here in case someone has the same problem.

The function shell_exec works like this:

$var = shell_exec('python path/to/your/python/script.py '.$var1.' '.$var2. ...);

The arguments you wanna pass to your python script MUST be separated by a white space, that's how python will interpret the multi variables you are sending.

The string "Green Day" has a white space within it, so it was like sending

$var = shell_exec('python path/to/your/python/script.py Green Day');

So when I'd do sys.argv[1] in Python, it would get only "Green" cause "Day" would be the "second" parameter.

So just loop through your sys.argv in Python and concatenate the strings like this:

string = ''
for word in sys.argv[1:]:
    string += word + ' '

edited Sep 17, 2017 at 19:31

Chris

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answered Apr 21, 2014 at 14:43

Thiago

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3 Comments

Luis Masuelli Over a year ago

Have you tried quoting your parameters? "Green Day" (repr: '"Green Day"')

Thiago Over a year ago

I'm not sending the "raw string", the string is contained in $var1. The solution I give above works well.

Luis Masuelli Over a year ago

if, some times, you want to parse more complex arguments (even arguments having quotes) read this article

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