PHP echo statement with URL parameter - php

Question

I wrote a mini script in PHP to send a POST request to the web server:
<?php
$cid = file_get_contents('cid');
function httpPost($url)
{
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POST, true);
$output=curl_exec($ch);
curl_close($ch);
return $output;
}
echo httpPost("http://172.17.0.1:2375/containers/$cid/stop?t=5");
?>
Yes, this is Docker. I'm using the remote API in Docker, and this little piece of script works!
However, the ?t=5 at the end of the URL, gets ignored.
I guess it has to do with the ?.
How do I get this URL properly formatted, so that the ?t=5 works correctly?
(I tried 1,001 ways so far, with quotes and double quotes, with no luck. After more than 4 hours spent on this, I thought stackoverflow could help?)
Thanks...
NOTE: the "cid" is only a file on the hard-drive, that stores the container id. So I'm retrieving the container id from the file, and passing it to the URL (this part works, anyway).
The complete URL is written by me, i.e. not parsed.

Answer 1

Since there are no special requirements on your URL, why use an incomplete cURL wrapper function? You can simply do
echo file_get_contents("http://172.17.0.1:2375/containers/$cid/stop?t=5");
To answer your actual question as to why your query string gets ignored, it is because it is not being sent to the server properly. Google CURLOPT_POSTFIELDS
Edit Since it was mentioned that the request method has to be POST, you can change things a little in your cURL code to cater for that
curl_setopt($ch, CURLOPT_POSTFIELDS,"t=5");
Then you can call your function like
echo httpPost("http://172.17.0.1:2375/containers/$cid/stop");

Answer 2

Since you are trying a POST request you can modify your function a bit. For $data you can pass array("t"=>5).
function httpPost($url, $data = '')
{
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POST, true);
if ($data != '')
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$output=curl_exec($ch);
curl_close($ch);
return $output;
}

Answer 3

You might try executing like this?
<?php
$cid = file_get_contents('cid');
function containeraction($cid, $action, $s) {
//Time in Seconds
$timedelay="t=".$s;
//Docker Container Host
$dockerhost="172.17.0.1";
//Host Port
$port="2375";
$url = "http://".$dockerhost.":".$port."/containers/".$cid."/".$action;
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POSTFIELDS, $timedelay);
$output=curl_exec($ch);
curl_close($ch);
return $output;
}
//containeraction(container id, action, delay)
echo containeraction($cid, "stop", "5");
?>

Answer 4

Your curl setup works against Docker and passes the query string. You do need to trim whitespace when reading files in case there is a new line at the end.
<?php
$cid = trim(file_get_contents('cid'));
echo "$cid\n";
function httpPost($url)
{
$ch = curl_init();
curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch,CURLOPT_POST, true);
$output=curl_exec($ch);
curl_close($ch);
return $output;
}
$url = "http://172.17.0.1:2375/containers/$cid/stop?t=6";
echo "$url\n";
echo httpPost($url)
?>