getting parameter from a response curl php

Question

I'm really newbie with php. I'm trying to develop a simple php app. I have a button in my app and I want when I click on it to open some webpage, allow an user to connect using his credential. When the user is connected he can grant me a privilege to access to his information by clicking in some button "Allow". After clicking in that button, he is redirected to an url that contain a parameter named "code". My goal is to use this code parameter in my php script. I found some information about curl and I guess I need it to do that but how ? I can open google webpage by doing this :

<?php
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, "http://www.google.com");
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
print $result;
?>

To resume I would like to know : 1) After redirecting the user to a website, after his logging and allowing me to access to his data, how can I get a parameter that is include to the url he is redirected after allowing me the access. Thank you in advance for your help.

Answer 1

You can get the URL parametrs by GET, example

www.example.com/user?id=1111&Fname=john&Lname=Doe

...in your PHP : ...

$id=$_GET['id'];
$Fname=$_GET['Fname'];
$Lname=$_GET['Lname'];

To use the CURL :

<?php
$url="yourURL?id=$id&Fname=$Fname&Lname=$Lname";

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
print $result;
?>