Stop Forum Spam (block abusive ip addresses and emails from signing up)

stopforumspam.php

<?php
function get_web_page($url, $cookiesIn = '')
{
    $options = array(
        CURLOPT_RETURNTRANSFER => true, // return web page
        CURLOPT_HEADER => true, //return headers in addition to content
        CURLOPT_FOLLOWLOCATION => true, // follow redirects
        CURLOPT_ENCODING => "", // handle all encodings
        CURLOPT_AUTOREFERER => true, // set referer on redirect
        CURLOPT_CONNECTTIMEOUT => 120, // timeout on connect
        CURLOPT_TIMEOUT => 120, // timeout on response
        CURLOPT_MAXREDIRS => 10, // stop after 10 redirects
        CURLINFO_HEADER_OUT => true,
        CURLOPT_SSL_VERIFYPEER => false, // Disabled SSL Cert checks
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_COOKIE => $cookiesIn
    );
    
    $ch = curl_init($url);
    curl_setopt_array($ch, $options);
    $rough_content = curl_exec($ch);
    $err           = curl_errno($ch);
    $errmsg        = curl_error($ch);
    $header        = curl_getinfo($ch);
    curl_close($ch);
    
    $header_content = substr($rough_content, 0, $header['header_size']);
    $body_content   = trim(str_replace($header_content, '', $rough_content));
    $pattern        = "#Set-Cookie:\\s+(?<cookie>[^=]+=[^;]+)#m";
    preg_match_all($pattern, $header_content, $matches);
    $cookiesOut = implode("; ", $matches['cookie']);
    
    $header['errno']   = $err;
    $header['errmsg']  = $errmsg;
    $header['headers'] = $header_content;
    $header['content'] = $body_content;
    $header['cookies'] = $cookiesOut;
    return $header;
}

// stopforumspam.com API
function sfs_ip($ip)
{
    //$response = file_get_contents('http://www.stopforumspam.com/api?ip='.$ip); //curl is installed
    $response = get_web_page('http://www.stopforumspam.com/api?ip=' . $ip); //curl is not installed
    $response = $response['content'];
    $pattern  = '/<appears>yes<\/appears>/';
    if (preg_match($pattern, $response)) {
        return true;
        //require_once( './stopspammer.html' );
        //exit();
    } else {
        return false;
    }
}

function sfs_email($email)
{
    //$response = file_get_contents('http://www.stopforumspam.com/api?email='.$email); //curl is installed
    $response = get_web_page('http://www.stopforumspam.com/api?email=' . $_POST['email']); //curl is not installed
    $response = $response['content'];
    $pattern  = '/<appears>yes<\/appears>/';
    if (preg_match($pattern, $response)) {
        return true;
        //require_once( './stopspammer.html' );
        //exit();
    } else {
        return false;
    }
}


// ini_set('allow_url_fopen',1); //fix file_get_contents(): http:// wrapper is disabled in the server configuration by allow_url_fopen=0 error

$spammer1 = sfs_ip($_SERVER['REMOTE_ADDR']); //check if ip address is a spammer
$spammer2 = sfs_email($_POST['email']); // check if email address is a spammer

//$response = get_web_page('http://www.stopforumspam.com/api?email='.$_POST['email']); $response = $response['content']; 
//$response2 = get_web_page('http://www.stopforumspam.com/api?ip='.$_SERVER['REMOTE_ADDR']); $response2 = $response2['content']; 
//echo "$response // $response2";

if ($spammer1 === true || $spammer2 === true) {
    $notice = "You cannot signup because you're on a spammer blacklist. To get removed, go to <a href=\"http://stopforumspam.com/remove\">http://stopforumspam.com/remove</a>";
    //make the above variable a flash variable
    header("Location: $_SERVER[HTTP_REFERER] "); //redirect to referrer
}
?>