On 11-08-24 03:48 PM, Steve Edwards wrote:
On Wed, 24 Aug 2011, J Gao wrote:
I admit that using AGI() may not correct here. This is a work around
about passing multiple args to php script. (I had this trouble
before.) I would like to know what is the correct way to call the php
script through SYSTEM().
(Please keep in mind I'm not a PHP weenie so my experiences may be
colored by my C background.)
Depending on how your host is set up and the contents of your script,
it may be as simple as:
exten = *,n,system(example.php)
This assumes your script starts with a 'shebang' like:
#!/usr/bin/php -f
and that the path to example.php is enumerated in the PATH environment
variable of the Asterisk process.
If these conditions are not met, you can specify your way around them
in the parameters (arguments sound so argumentative) passed to the
system() application.
The process executing Asterisk must also have execute permission to
every directory in the path to the script and both read and execute
permissions to the script. Using '777' is insecure and the mark of a
newb.
You can pass multiple parameters on the command line like:
exten = *,n,system(echo ${EPOCH} ${CHANNEL} >/tmp/foo)
You can confirm its execution with:
cat /tmp/foo
(When I wrote this example, I used the EXTEN channel variable instead
of EPOCH. Extra points for the first reader to explain why that was
not a good example. Anyone, anyone?)
So the problem is not passing multiple parameters, but accessing them
in your program.
In most programming languages, the program initialization code creates
and populates an array containing either the parameters or pointers to
the parameters.
In PHP, the array is named $argv. In C, it is whatever the programmer
named the second parameter to the main() function. I think most C
programmers name this array of char pointers argv because everybody
expects that it have this name.
In any case, the 'zeroth' element contains the path to the program
which may be useful if you have multiple links to the program because
you want the program to behave differently depending on which link was
used to execute the program. Probably not, but now you know.
Within your script you can access the command line parameters with
code like:
#!/usr/bin/php -f
<?
echo "The zeroth parameter is \"$argv[0]\"\n";
echo "The first parameter is \"$argv[1]\"\n";
echo "The second parameter is \"$argv[2]\"\n";
exit(0);
?>
If you were to execute this script with a dialplan like:
exten = *,n,system(echo.php ${EPOCH} ${CHANNEL} >/tmp/foo)
you would find that /tmp/foo contained:
The zeroth parameter is "./echo.php"
The first parameter is "1314224887" The second parameter is
"SIP/841-line-1-b7961340"
Personally (leaping up on my soapbox), I find specifying a bunch of
anonymous parameters difficult to maintain. I prefer to use the
getopt() function in PHP (or getopt_long() function in C) and define a
'self-documenting' command line. (I also do this for my AGIs.)
For example, I would define '--channel' and '--epoch' options so that
I could execute the above example like:
exten = *,n,system(echo.php --epoch=${EPOCH}
--channel=${CHANNEL})
or
exten = *,n,system(echo.php --channel=${CHANNEL}
--epoch=${EPOCH})
Aside from allowing you to specify the parameters in any order (I'm
big on 'alphabetization'), it is much easier to maintain when you pass
several parameters.
Thank you Steve for the reply. I tested your way and it works. So I am
going to correct my scripts. (But I hasn't figure out your question
about the using of EXTEN channel variable. I can only guessing it could
be you are using "*".)
Cheers,
jian
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