Need to login to ipb board with php and curl

I'm trying to login to IP board with CURL and PHP. This is the code that I'm using. Anyone have an idea?

<?php

    $url=stream_get_contents(fopen('https://invisioncommunity.com/login/', "rb"));

    function get_string_between($string, $start, $end){
        $string = ' ' . $string;
        $ini = strpos($string, $start);
        if ($ini == 0) return '';
        $ini += strlen($start);
        $len = strpos($string, $end, $ini) - $ini;
        return substr($string, $ini, $len);
    }

    $csrf_key = get_string_between($url, '" value="', '">');

    $path = "/root/ctemp";

    $postinfo = "csrfKey=".$csrf_key."&auth=____USERNAME_______&password=___PASSWORD____&remember_me=1&_processLogin=usernamepassword&_processLogin=usernamepassword";
    $cookie_file_path = $path."/cookie.txt";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_NOBODY, false);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_file_path);
    //set the cookie the site has for certain features, this is optional
    curl_setopt($ch, CURLOPT_COOKIE, "cookiename=0");
    curl_setopt($ch, CURLOPT_USERAGENT,
        "Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.12) Gecko/20050915 Firefox/1.0.7");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_REFERER, "https://invisioncommunity.com/login/");
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);

    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postinfo);
    curl_exec($ch);

    //page with the content I want to grab
    curl_setopt($ch, CURLOPT_URL, "https://invisioncommunity.com/discover/unread/");

    //do stuff with the info with DomDocument() etc
    $html = curl_exec($ch);

    echo $html;

    curl_close($ch);
    ?>

yeah, your csrf token is tied to a cookie session given to the stream_get_contents request, without that cookie, your csrf token is worthless, and you never extract the cookie from stream_get_contents (and i don't think stream_get_contents even support doing that), rewrite it with the curl_ api, and make sure curl's cookie system is enabled (eg, set CURLOPT_COOKIEFILE to emptystring, that will enable libcurl's cookie handling system). also your csrf extraction code is unreliable, it doesn't decode html entities (for example, if the csrf token contains an &, it will be html-encoded as &, but your code does not translate & back to &. ), use a proper HTML parser instead, like DOMDocument. also you don't urlencode csrf_key, so again it may be corrupted if it contains special characters (like an @, more on that later). use urlencode() or http_build_query() to properly urlencode the csrf key, and your username, and your password, because you're not urlencoding those either. did you know that the @ in your email must be encoded to %40 ? i bet, when you hardcode your login email, you just write foo@gmail.com, you don't write foo%40gmail.com, so you'll have to urlencode that too.

try this, using http_build_query to encode the post data, and DOMDocument to parse out the csrf token:

<?php
declare(strict_types = 1);
$ch = curl_init ();
curl_setopt_array ( $ch, array (
        CURLOPT_COOKIEFILE => '',
        CURLOPT_ENCODING => '',
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_FOLLOWLOCATION => 1,
        CURLOPT_URL => 'https://invisioncommunity.com/login/' 
) );
$html = curl_exec ( $ch );
$domd = @DOMDocument::loadHTML ( $html );
$xp = new DOMXPath ( $domd );
curl_setopt_array ( $ch, array (
        CURLOPT_URL => 'https://invisioncommunity.com/login/',
        CURLOPT_POST => 1,
        CURLOPT_POSTFIELDS => http_build_query ( array (
                'csrfKey' => $xp->query ( '//input[@name="csrfKey"]' )->item ( 0 )->getAttribute ( "value" ),
                'auth' => '____USERNAME_______',
                'password' => '___PASSWORD____',
                'remember_me' => 1,
                '_processLogin' => 'usernamepassword' 

        ) ) 
) );
$html = curl_exec ( $ch );
echo $html;