PHP + cURL How to post to Twitter "like a web browser"

Hello, my first topic here. I am trying to create a twitter tool in PHP that would allow me to post to Twitter, it's in PHP with cURL.
I don't want to use their crappy API so I'm trying to emulate what a web browser would do.

I can connect but can't post, I get this error : {"errors":[{"code":37,"message":"Not authorized to use this endpoint"}]}

I compared my request with the web browser's request on Wireshark and they seem pretty similar.

Does anyone have an idea on how to fix this ?

here is my code :

function tw_connect($user, $pwd) {

	$ch = curl_init('http://www.twitter.com');

	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

	$c = curl_exec($ch);

	curl_close($ch);

	preg_match_all('#authenticity_token" type="hidden" value="(.*)"#U', $c, $g);

	$g = $g[1][0];


	$post = array('authenticity_token' => $g, 'return_to_ssl' => 'false', 'redirect_after_login' => '/', 'session[username_or_email]' => $user, 'session[password]' => $pwd, 'q' => null);

	$ch = curl_init('https://twitter.com/sessions');

	curl_setopt($ch, CURLOPT_POST, TRUE);

	curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

	curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');

	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);

	curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Expect:' ) );

	curl_setopt($ch, CURLOPT_COOKIESESSION, TRUE);

	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

	$c = curl_exec($ch);

	curl_close($ch);

	echo $c;

}

function tw_submit($user, $pwd, $text) {

	tw_connect($user, $pwd);

	$ch = curl_init('http://www.twitter.com/');

	curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');

	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

	$c = curl_exec($ch);

	curl_close($ch);

	preg_match_all('#value=\'(.*)\' name=\'authenticity_token#U', $c, $g);

	$g = $g[1][0];


	$post = 'include_entities=true&status='.$text.'&post_authenticity_token='.$g;

	$ch = curl_init('http://api.twitter.com/1/statuses/update.json');

	curl_setopt($ch, CURLOPT_POST, TRUE);

	curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

	curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');

	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);

	curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 6.0; fr; rv:1.9.1.7) Gecko/20091221 Firefox/3.5.7 GTBDFff GTB7.0 (.NET CLR 3.5.30729)');

	curl_setopt($ch, CURLOPT_HTTPHEADER, array( 'Expect:', 'X-Requested-With: XMLHttpRequest', 'X-PHX: true', 'Referer: http://api.twitter.c..._receiver.html' ) );

	curl_setopt($ch, CURLOPT_COOKIESESSION, TRUE);

	curl_setopt($ch, CURLOPT_USERPWD, "$user:$pwd");

	//curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

	$c = curl_exec($ch);

	curl_close($ch);

	echo $c;

}

tw_submit('username', 'password', 'your text to send to twitter');