Micah Micah - 1 month ago 8
PHP Question

Executing Python Script with PHP Variables

I am writing a simple application that uses information from a form, passes it through $_POST to a PHP script that executes a python script and outputs the results. The problem I am having is that my python script is not actually running with the arguments being passed in.

process3.php file:

<?php
$start_word = $_POST['start'];
$end_word = $_POST['end'];
echo "Start word: ". $start_word . "<br />";
echo "End word: ". $end_word . "<br />";
echo "Results from wordgame.py...";
echo "</br>";
$output = passthru('python wordgame2.py $start_word $end_word');
echo $output;
?>


Output:

Start word: dog
End word: cat
Results from wordgame.py...
Number of arguments: 1 arguments. Argument List: ['wordgame2.py']


At the top of my wordgame2.py, I have the following (for debugging purposes):

#!/usr/bin/env python
import sys
print 'Number of arguments:', len(sys.argv), 'arguments.'
print 'Argument List:', str(sys.argv)


Why isn't the number of arguments being passed = 3?
(Yes, my form does send the data correctly.)

Any help is greatly appreciated!

Edit: I might add that it does run when I explicitly tell it the start and end word... something like this:

$output = passthru('python wordgame2.py cat dog');
echo $output

Answer

Update -

Now that I am aware of PHP, the mistake lies in using the single-quotes '. In PHP, single quoted strings are considered literals, PHP does not evaluate the content inside it. However, double quoted " strings are evaluated and would work as you are expecting them to. This is beautifully summarized in this SO answer. In our case,

$output = passthru("python wordgame2.py $start_word $end_word");

would work, but the following won't -

$output = passthru('python wordgame2.py $start_word $end_word');

Original answer -

I think the mistake lies in

$output = passthru("python wordgame2.py $start_word $end_word");

Try this

$output = passthru("python wordgame2.py ".$start_word." ".$end_word);