passing parameters from php to python incomplete

Question

I'm having a problem on passing the parameters from php to python.

By using the $_SERVER['QUERY_STRING'].

http://www.domain.com/path?a_num=123&msg=hello

i will put the a_num=123&msg=hello to a variable

$a = $_SERVER['QUERY_STRING'];
system("python python.py ".$a);

and in python will print it

a = sys.argv[1]
print a

and the result is *a_num=123* only

what is the problem?

The & is cutting off the rest of the string, but I'm not familiar enough with php to know how to rectify that. — jayelm
– jayelm, Commented Jan 30, 2014 at 1:51

Mark Streatfield · Accepted Answer · 2014-01-30 02:45:35Z

1

I don't think this is a problem with PHP, more how the system command is being executed. Assuming you are using Linux, the '&' character in the command:

python python.py a_num=123&msg=hello

Is being interpreted as a control operator. From the documentation for bash (although this applies equally to other shells such as tcsh):

If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0.

To prevent this, you need to quote the string being passed:

python python.py "a_num=123&msg=hello"

Which in PHP would look like:

system("python python.py \"".$a."\"");

answered Jan 30, 2014 at 2:45

Mark Streatfield

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