Help with Curl needed

I've given up on using imacros and am now learning Curl, I already know PHP fairly well at this point, I'm testing this to login to twitter and make a tweet post, I know this can be done via the API but its more that I want to be able to automate any web tasks (so this is helping me learn) and its bothering me that I can't get this to work and also I want to register accounts via curl on twitter which can't be done via the api.

One thing that I found weird is that I have to post the login POST as the url for it to work.. when I watch the output of the 2nd curl call (where it attempts to post the tweet) it shows the page as having the tweet entered in the input box but it doesn't go through and actually make the tweet.. I've already spent countless hours trying to figure this out.. I got the POST calls from wireshark, using the full TCP package (or whatever its called)... I would greatly appreciate any advice

<CODE>

<?php


curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_COOKIEJAR, "C:/Users/a/work-current/cookies/my_cookies.txt");
curl_setopt($ch, CURLOPT_COOKIEFILE, "C:/Users/a/work-current/cookies/my_cookies.txt");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0) ;
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0) ;

curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.3)
//Gecko/20100401 Firefox/3.6.3");

curl_exec($ch);


#### set curl login post string
$test_username = 'myuseraccnt';
$test_password = 'mypassword';

$curl_login_post = "https://twitter.com/sessions?authenticity_token=c3884f449f86484198b26fc0c8adc79275ad4552&authenticity_token=c3884f449f86484198b26fc0c8adc79275ad4552&return_to_ssl=false&session[username_or_email]=". $test_username . "&session[password]=". $test_password . "&commit=Sign+In" ;

// login via curl
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $curl_login_post);
curl_setopt($ch, CURLOPT_URL, $curl_login_post);

curl_exec($ch);

// post tweet via curl

$test_tweet = "authenticity_token=c3884f449f86484198b26fc0c8adc79275ad4552&status=teeessssssstttttttwwwwwwweeeeetttttttt%0A&twttr=true&return_rendered_status=true&lat=&lon=&place_id=&display_coordinates=false" ;


curl_setopt($ch, CURLOPT_POST, 'TRUE');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_REFERER, 'http://twitter.com');
curl_setopt($ch, CURLOPT_POSTFIELDS, $test_tweet);
curl_setopt($ch, CURLOPT_URL, 'http://twitter.com' );

curl_exec($ch);



?>


</CODE>

1)First you have to get Auth Token
-go to twitter.com
-parse source code to find auth token
2)Use this auth toket to log in and post your tweet

Thanks for the responses.. yes I am aware of the need for the authenticity code, I manually parsed it for this but was planning to write a php function to do this once I got the posting functionality to work.. I did it before by taking it from the cookies file that I set with curl... I will try the code posted by kaimi.. thanks