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CAPTCHA

thenature4u

By thenature4u
in PHP Coding Help

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thenature4u Member

thenature4u

Posted
Posted

i have some code for captcha, its working. but my problem is, its printing only 5 characters, i want to increase upto 8 characters. please help me

 

 

mtc.class.php

 

<?php

/**

* My Two Cents - A simple comment system

* 2005-2007 © Andreas Gohr <[email protected]>

*/

 

 

if(!defined('MTC')) define('MTC','MTC'); // used for all POST/GET vars and CSS classes

 

// The MTC main class

class MTC {

    // DB connection

    var $db_host    = 'localhost';

    var $db_user    = 'mtc';

    var $db_pass    = 'mtc';

    var $db_name    = 'mtc';

 

    // web path to the class file

    var $self      = 'mtc.class.php';

 

    // antispam

    var $blacklist  = 'blacklist.txt';

    var $captcha    = true;

    var $audio      = false;

    var $showmail  = false;

 

    // output

    var $addcss    = true;

    var $target    = '';

 

    // admin stuff

    var $adminpass  = '';

    var $notify    = '';

    var $gravopts  = '&rating=R';

 

 

    // language strings

    var $lang = array(

                    'name'      => 'Your Name:',

                    'email'    => 'Your E-Mail:',

                    'web'      => 'Website (optional):',

                    'captcha'  => 'Security Code:',

                    'comment'  => 'Your two Cents:',

                    'info'      => 'No HTML allowed. URLs will be linked with nofollow attribute. Whitespace is preserved.',

                    'audio'    => 'Click to hear the security code spelled.',

                    'nofield'  => 'Sorry, you need to fill all necessary fields!',

                    'noemail'  => 'Sorry, this mail address doesn\'t look valid.',

                    'noweb'    => 'Sorry, this web address doesn\'t look valid.',

                    'nocaptcha' => 'Sorry, the security code was wrong.',

                    'nospam'    => 'Sorry, spamming is not allowed here.',

                );

 

    // you may want to change this for more secure captchas

    var $secret    = 'CHANGEME!';

 

 

    // internal only

    var $db_link;

    var $captchafnt;

    var $audiodir = '';

    var $message  = '';

    var $page    = '';

 

    /**

    * Constructor

    */

    function MTC(){

        $this->captchafnt = glob(dirname(__FILE__).'/MTC/fonts/*.ttf');

        $this->audiodir = dirname(__FILE__).'/MTC/audio/';

 

        // auto set the secret (for lazy ones)

        $secret .= $_SERVER['HTTP_USER_AGENT'];

        $secret .= $_SERVER['SERVER_SOFTWARE'];

        $secret .= __FILE__;

        $secret = md5($secret);

 

        if($this->target){

            $this->target = 'target="'.$this->target.'"';

        }

    }

 

    /**

    * To be called in the head section. Handles intializing

    * and POST/GET variables

    */

    function init($page = ''){

        if(!$page){

            $this->page = $_SERVER['PHP_SELF'];

        }else{

            $this->page = $page;

        }

 

        // we do not touch other's variables

        if(get_magic_quotes_gpc() && !defined('MAGIC_QUOTES_STRIPPED')){

            if (!empty($_POST[MTC]))    $this->_remove_magic_quotes($_POST[MTC]);

            if (!empty($_GET[MTC]))    $this->_remove_magic_quotes($_GET[MTC]);

            if (!empty($_REQUEST[MTC])) $this->_remove_magic_quotes($_REQUEST[MTC]);

        }

 

        echo $this->print_css();

 

        if($_POST[MTC]['do'] == 'add'){

            $this->_add_comment();

        }else if($_POST[MTC]['do'] == 'del'){

            $this->_del_comment();

        }

 

    }

 

    /**

    * return the number of comments

    */

    function comment_count($page=''){

        if(!$page) $page = $this->page;

        $page = md5($page);

 

        $sql = "SELECT COUNT(*) as cnt

                  FROM mtc_comments

                WHERE page = '$page'";

        $handle = $this->_get_dbhandle();

        if(!$handle) return false;

        $result = mysql_query($sql,$handle);

        $row = mysql_fetch_assoc($result);

        mysql_free_result($result);

        return $row['cnt'];

    }

 

    /**

    * List available comments

    */

    function comments($page=''){

        if(!$page) $page = $this->page;

        $page = md5($page);

 

        $sql = "SELECT id, name, mail, web, text, date

                  FROM mtc_comments

                WHERE page = '$page'

              ORDER BY date";

 

        $handle = $this->_get_dbhandle();

        if(!$handle) return;

        $result = mysql_query($sql,$handle);

 

        while ($row = mysql_fetch_assoc($result)) {

            $this->format_comment($row);

        }

        mysql_free_result($result);

    }

 

    /**

    * Show the form to add new comments

    */

    function comment_form(){

 

        /*echo '<div class="'.MTC.'_form" id="'.MTC.'_form">';

        $this->_print_message();

        echo '<form action="#'.MTC.'_form" method="post" accept-charset="utf-8">';

        echo '<input type="hidden" name="'.MTC.'[do]" value="add" style="display:none" />';

        echo '<input type="hidden" name="'.MTC.'

" value="'.htmlspecialchars($this->page).'" style="display:none" />';

 

        echo '<div class="'.MTC.'_name">';

        echo '<label for="'.MTC.'_name">'.$this->lang['name'].'</label>';

        echo '<input type="text" name="'.MTC.'[name]" value="'.htmlspecialchars($_POST[MTC]['name']).'" id="'.MTC.'_name" />';

        echo '</div>';

 

        echo '<div class="'.MTC.'_mail">';

        echo '<label for="'.MTC.'_mail">'.$this->lang['email'].'</label>';

        echo '<input type="text" name="'.MTC.'[mail]" value="'.htmlspecialchars($_POST[MTC]['mail']).'" id="'.MTC.'_mail" />';

        echo '</div>';

 

        echo '<div class="'.MTC.'_web">';

        echo '<label for="'.MTC.'_web">'.$this->lang['web'].'</label>';

        echo '<input type="text" name="'.MTC.'[web]" value="'.htmlspecialchars($_POST[MTC]['web']).'" id="'.MTC.'_web" />';

        echo '</div>';*/

 

        if($this->captcha){

            echo '<div class="'.MTC.'_captcha">';

            //echo '<label for="'.MTC.'_captcha">'.$this->lang['captcha'].'</label>';

          // echo '<input type="text" name="'.MTC.'[captcha]" value="" id="'.MTC.'_captcha" />';

            echo '</div>';

            $this->print_captcha();

        }

 

        /*echo '<div class="'.MTC.'_text">';

        echo '<label for="'.MTC.'_text">'.$this->lang['comment'].'</label>';

        echo '<textarea cols="40" rows="10" name="'.MTC.'[text]" id="'.MTC.'_text">'.htmlspecialchars($_POST[MTC]['text']).'</textarea>';

        echo '</div>';

 

        echo '<input type="submit" value="Save" />';

        echo '<p class="'.MTC.'_info">'.$this->lang['info'].'</p>';

        echo '</form>';

        echo '</div>';*/

    }

 

    /**

    * Defines how a comment is printed. You may want to tweak this, but using CSS should be

    * enough usually

    */

    function format_comment($row){

        static $number = 0;

        $number++;

 

        $md5 = md5($row['mail']);

        $obf = strtr($row['mail'],array('@' => ' [at] ', '.' => ' [dot] ', '-' => ' [dash] '));

 

        $text = htmlspecialchars($row['text']);

        $text = preg_replace('/\t/','    ',$text);

        $text = preg_replace('/  /','  ',$text);

        $text = preg_replace_callback('/((https?|ftp):\/\/[\w-?&;#~=\.\/\@]+[\w\/])/ui',

                                      array($this,'_format_link'),$text);

        $text = nl2br($text);

 

        $opts = str_replace('@MD5@',$md5,$this->gravopts);

 

        echo '<div class="'.MTC.'_comment" id="comment-'.$number.'">';

        echo '<img src="http://www.gravatar.com/avatar.php?gravatar_id='.$md5.$opts.'" alt="" />';

        echo '<a href="#comment-'.$number.'" rel="self bookmark" class="'.MTC.'_link">'.$number.'</a>';

 

        echo '<div class="'.MTC.'_text">';

        echo $text;

        echo '</div>';

 

        echo '<div class="'.MTC.'_info">';

 

        echo '<div class="'.MTC.'_date">';

        echo $row['date'];

        echo '</div>';

 

        echo '<div class="'.MTC.'_user">';

        if($row['web']){

            echo '<a href="'.htmlspecialchars($row['web']).'" rel="nofollow" '.$this->target.' class="url">';

            echo htmlspecialchars($row['name']);

            echo '</a>';

        }elseif($this->showmail){

            echo '<a href="mailto:'.htmlspecialchars($obf).'" class="mail">';

            echo htmlspecialchars($row['name']);

            echo '</a>';

        }else{

            echo htmlspecialchars($row['name']);

        }

        echo '</div>';

 

        echo '</div>';

 

        echo '<div class="'.MTC.'_clear"></div>';

        $this->_admin_opts($row['id']);

        echo '</div>';

    }

 

    /**

    * Prints minimal CSS for initial styling. Can be suppressed

    * with the addcss property.

    */

    function print_css(){

        if(!$this->addcss) return;

        echo '<style type="text/css">';

        echo '.'.MTC."_message { text-align: center; color: #f00 }";

 

        echo '#'.MTC."_form input { margin-left: 50px; display: block; width: 250px; }";

        echo '#'.MTC."_form textarea { margin-left: 50px; display: block; width: 550px; }";

        echo '#'.MTC."_form div.".MTC."_name { float: left; }";

        echo '#'.MTC."_form div.".MTC."_mail { float: left; }";

        echo '#'.MTC."_form div.".MTC."_web  { float: left; clear: left;}";

        echo '#'.MTC."_form div.".MTC."_captcha { float: left; clear: left;}";

        echo '#'.MTC."_form img.".MTC."_captcha { float: left; margin-left: 50px;}";

        echo '#'.MTC."_form div.".MTC."_text { clear: left; }";

 

        echo 'div.'.MTC."_comment { border-bottom: 1px solid #000; margin-top: 0.5em; }";

        echo 'div.'.MTC."_comment img { float:left; z-index: 10}";

        echo 'div.'.MTC."_comment a.".MTC."_link { text-decoration: none; position: absolute; color: #999; font-size: 1.5em; z-index:50; float: left; font-weight: bold;}";

        echo 'div.'.MTC."_comment div.".MTC."_date { display: inline; margin-right: 0.5em }";

        echo 'div.'.MTC."_comment div.".MTC."_info { margin-left: 100px; font-style: italic;}";

        echo 'div.'.MTC."_comment div.".MTC."_user { display: inline; }";

        echo 'div.'.MTC."_comment div.".MTC."_text { margin-left: 100px; margin-bottom: 1em; }";

        echo 'div.'.MTC."_comment div.".MTC."_clear { clear: both; line-height: 1px; height: 1px; }";

        echo '</style>';

    }

 

    /**

    * Creates a simple 200x50 CAPTCHA image

    */

    function captcha_image(){

        $text = $this->x_Decrypt($_REQUEST[MTC]['captcha'],$this->secret);

 

        // create a white image

        $img = imagecreate(200, 50);

        imagecolorallocate($img, 255, 255, 255);

 

        // add some lines as background noise

        for ($i = 0; $i < 60; $i++) {

            $color = imagecolorallocate($img,rand(100, 250),rand(100, 250),rand(100, 250));

            imageline($img,rand(0,200),rand(0,50),rand(0,200),rand(0,50),$color);

        }

 

        // draw the letters

        for ($i = 0; $i < strlen($text); $i++){

            $font  = $this->captchafnt[array_rand($this->captchafnt)];

            $color = imagecolorallocate($img, rand(0, 100), rand(0, 100), rand(0, 100));

            $size  = rand(16,25);

            $angle = rand(-30, 30);

 

            $x = 10 + $i * 40;

            $cheight = $size + ($size*0.5);

            $y = floor(50 / 2 + $cheight / 4);

 

            imagettftext($img, $size, $angle, $x, $y, $color, $font, $text[$i]);

        }

 

        header("Content-type: image/jpeg");

        imagejpeg($img);

        imagedestroy($img);

    }

 

    /**

    * Stiches an audio CAPTCHA

    */

    function captcha_audio(){

        $text = $this->x_Decrypt($_REQUEST[MTC]['captcha'],$this->secret);

        $text = strtolower($text);

 

        // prepare wave files

        $wavs = array();

        for($i=0;$i<5;$i++){

            $wavs[] = $this->audiodir.'/'.$text{$i}.'.wav';

        }

        // send stiched one

        header('Content-type: audio/x-wav');

        header('Content-Disposition: attachment;filename=captcha.wav');

        echo $this->_joinwavs($wavs);

    }

 

    /**

    * Print the HTML for the CAPTCHA

    */

    function print_captcha(){

    $code = $this->_gen_rand();

// Here the value of text1 is use for store in session by rakesh..

$text1 = $code;

        $code = $this->x_Encrypt($code,$this->secret);

 

 

        echo '<input type="hidden" name="MTC

" value="'.htmlspecialchars($code).'" style="display:none" />';

        if($this->audio){
        	$_SESSION['captchaUser']=htmlspecialchars($text1);
            echo '<a href="../mtc/'.$this->self.'?MTC[do]=audio&MTC[captcha]='.urlencode($code).'" title="'.$this->lang['audio'].'">';
        }
        echo '<img src="../mtc/'.$this->self.'?MTC[do]=captcha&MTC[captcha]='.urlencode($code).'" width="200" height="50" alt="CAPTCHA" class="'.MTC.'_captcha" border="0" />';
        if($this->audio){
            echo '</a>';
        }
    }

    /**
     * Generate a 5 char random code
     */
    function _gen_rand(){
        $code = '';
        for($i=0;$i<5;$i++){
            $code .= chr(rand(65, 90));
        }
        return $code;
    }

    /**
     * Callback to autolink a URL (with shortening)
     */
    function _format_link($match){
        $url = $match[1];
        str_replace("\\\\'","'",$url);
        if(strlen($url) > 40){
            $title = substr($url,0,30).' … '.substr($url,-10);
        }else{
            $title = $url;
        }
        $link = '<a href="'.$url.'" '.$this->target.' rel="nofollow">'.$title.'</a>';
        return $link;
    }

    /**
     * Join multiple wav files
     *
     * All wave files need to have the same format and need to be uncompressed.
     * The headers of the last file will be used (with recalculated datasize
     * of course)
     *
     * @link http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/
     * @link http://www.thescripts.com/forum/thread3770.html
     * @link http://www.splitbrain.org/blog/2006-11/15-joining_wavs_with_php
     */
    function _joinwavs($wavs){
        $fields = join('/',array( 'H8ChunkID', 'VChunkSize', 'H8Format',
                                  'H8Subchunk1ID', 'VSubchunk1Size',
                                  'vAudioFormat', 'vNumChannels', 'VSampleRate',
                                  'VByteRate', 'vBlockAlign', 'vBitsPerSample' ));

        $data = '';
        foreach($wavs as $wav){
            $fp     = fopen($wav,'rb');
            $header = fread($fp,36);
            $info   = unpack($fields,$header);

            // read optional extra stuff
            if($info['Subchunk1Size'] > 16){
                $header .= fread($fp,($info['Subchunk1Size']-16));
            }

            // read SubChunk2ID
            $header .= fread($fp,4);

            // read Subchunk2Size
            $size  = unpack('vsize',fread($fp, 4));
            $size  = $size['size'];

            // read data
            $data .= fread($fp,$size);
        }

        return $header.pack('V',strlen($data)).$data;
    }


    /**
     * Prints the form tags for admin
     */
    function _admin_opts($id){
        if(!$_REQUEST[MTC]['admin']) return;
        echo '<div class="'.MTC.'_admform">';
        echo '<form action="#'.MTC.'_form" method="post" accept-charset="utf-8">';
        echo '<input type="hidden" name="'.MTC.'[do]" value="del" style="display:none" />';
        echo '<input type="hidden" name="'.MTC.'
" value="'.htmlspecialchars($this->page).'" style="display:none" />';
        echo '<input type="hidden" name="'.MTC.'[id]" value="'.$id.'" style="display:none" />';

        echo '<label for="'.MTC.'_admpass">Admin Password:</label>';
        echo '<input type="password" name="'.MTC.'[admpass]" value="" id="'.MTC.'_admpass" />';

        echo '<input type="submit" value="Delete" />';
        echo '</form>';
        echo '</div>';
    }

    /**
     * Does the work for deleting a comment
     */
    function _del_comment(){
        $page    = trim($_POST[MTC]['page']);
        $id      = trim($_POST[MTC]['id']);
        $admpass = $_POST[MTC]['admpass'];

        if(! ($page && $id && $admpass) ){
            $this->message .= 'Sorry, missing parameters! Admin password given?';
            return;
        }

        if($this->adminpass != $admpass){
            $this->message .= 'Sorry, wrong password.';
            return;
        }

        $page = md5($page);
        $id   = addslashes($id);
        $sql = "DELETE FROM mtc_comments
                      WHERE page = '$page'
                        AND id = '$id'";

        $handle = $this->_get_dbhandle();
        if(!$handle) return;
        mysql_query($sql,$handle);

        $this->message = 'Comment deleted';
    }

    /**
     * Does the work for adding a comment
     */
    function _add_comment(){
        $page = trim($_POST[MTC]['page']);
        $name = trim($_POST[MTC]['name']);
        $mail = trim($_POST[MTC]['mail']);
        $web  = trim($_POST[MTC]['web']);
        $text = trim($_POST[MTC]['text']);
        $cptc = trim($_POST[MTC]['captcha']);
        $code = trim($_POST[MTC]['code']);

        if(! ($page && $name && $mail && $text) ){
            $this->message .= $this->lang['nofield'];
            return;
        }

        if($this->captcha){
            if(!$cptc || !$code ||
               (strtoupper($cptc) != strtoupper($this->x_Decrypt($code,$this->secret)))
              ){
                $this->message .= $this->lang['nocaptcha'];
                return;
            }
        }else{
            $code = $this->_gen_rand();
        }

        if($web && !preg_match('=https?://=i',$web)){
            $this->message .= $this->lang['noweb'];
            return;
        }

        if(!$this->_isvalid_mail($mail)){
            $this->message .= $this->lang['noemail'];
            return;
        }

        if($this->_check_blacklist($text)){
            $this->message .= $this->lang['nospam'];
            return;
        }

        $ip   = $_SERVER['REMOTE_ADDR'];
        $this->_mail($page,$name,$mail,$text,$ip,$_SERVER['PHP_SELF']);

        $url  = addslashes($page);
        $page = md5($page);
        $name = addslashes($name);
        $mail = addslashes($mail);
        $web  = addslashes($web);
        $text = addslashes($text);
        $ip   = addslashes($ip);
        $code = addslashes($code);

        $sql = "INSERT IGNORE INTO mtc_comments
                        SET page = '$page',
                            name = '$name',
                            mail = '$mail',
                            web  = '$web',
                            text = '$text',
                            date = NOW(),
                            ip = '$ip',
                            url  = '$url',
                            captcha = MD5('$code')";

        $handle = $this->_get_dbhandle();
        if(!$handle) return;
        mysql_query($sql,$handle);

        // clear form
        $_POST[MTC]['page'] = '';
        $_POST[MTC]['name'] = '';
        $_POST[MTC]['mail'] = '';
        $_POST[MTC]['web']  = '';
        $_POST[MTC]['text'] = '';
    }

    /**
     * If the notify property is set this function will send a
     * mail for each comment created.
     */
    function _mail($page,$name,$mail,$text,$ip,$url){
        if(!$this->notify) return;

        $body  = "The following comment was added:\n\n";
        $body .= "Name: $name\n";
        $body .= "Mail: $mail\n";
        $body .= "Date: ".date('r')."\n";
        $body .= "IP  : $ip\n";
        $body .= "Page: $page\n";
        $body .= "URL : http://".$_SERVER['HTTP_HOST'].$url."\n\n";
        $body .= $text;

        $body = base64_encode($body);

        $header  = "MIME-Version: 1.0\n";
        $header .= "Content-Type: text/plain; charset=UTF-8\n";
        $header .= "Content-Transfer-Encoding: base64";

        $subject = '['.MTC.'] New comment added';

        mail($this->notify,$subject,$body,$header);
    }

    /**
     * Output a message if one is set
     */
    function _print_message(){
        if(!$this->message) return;
        print '<div class="'.MTC.'_message">';
        print htmlspecialchars($this->message);
        print '</div>';
    }

    /**
     * Connect to the database and return a handle
     */
    function _get_dbhandle(){
        if($this->link) return $this->link;

        $this->link = @mysql_connect($this->db_host, $this->db_user, $this->db_pass);
        if(!$this->link){
            $this->message .= 'Could not connect to database: '.mysql_error();
            return false;
        }

        if(!@mysql_select_db($this->db_name)){
            $this->message .= 'Could not select database';
            return false;
        }

        return $this->link;
    }

    /**
     * Uses a regular expresion to check if a given mail address is valid
     *
     * May not be completly RFC conform!
     *
     * @link    http://www.webmasterworld.com/forum88/135.htm
     *
     * @param   string $email the address to check
     * @return  bool          true if address is valid
     */
    function _isvalid_mail($email){
        return eregi("^[0-9a-z]([+-_.]?[0-9a-z])*@[0-9a-z]([-.]?[0-9a-z])*\\.[a-z]{2,4}$", $email);
    }


    /**
     * Spamcheck against wordlist
     *
     * Checks the wikitext against a list of blocked expressions
     * returns true if the text contains any bad words
     *
     * @author Andreas Gohr <[email protected]>
     */
    function _check_blacklist($text){
        if(!@file_exists($this->blacklist)) return false;
        $blockfile = file($this->blacklist);
        //how many lines to read at once (to work around some PCRE limits)
        if(version_compare(phpversion(),'4.3.0','<')){
            //old versions of PCRE define a maximum of parenthesises even if no
            //backreferences are used - the maximum is 99
            //this is very bad performancewise and may even be too high still
            $chunksize = 40;
        }else{
            //read file in chunks of 600 - this should work around the
            //MAX_PATTERN_SIZE in modern PCRE
            $chunksize = 200;
        }
        while($blocks = array_splice($blockfile,0,$chunksize)){
            $re = array();
            #build regexp from blocks
            foreach($blocks as $block){
                $block = preg_replace('/#.*$/','',$block);
                $block = trim($block);
                if(empty($block)) continue;
                $re[]  = $block;
            }
            if(preg_match('#('.join('|',$re).')#si',$text)) return true;
        }
        return false;
    }

    /**
     * remove magic quotes recursivly
     *
     * @author Andreas Gohr <[email protected]>
     */
    function _remove_magic_quotes(&$array) {
        if(!is_array($array)) return;
        foreach (array_keys($array) as $key) {
            if (is_array($array[$key])) {
                remove_magic_quotes($array[$key]);
            }else {
                $array[$key] = stripslashes($array[$key]);
            }
        }
    }


    /**
     * Simple XOR encryption
     *
     * @author Dustin Schneider
     * @link http://www.phpbuilder.com/tips/item.php?id=68
     */
    function x_Encrypt($string, $key){
        for($i=0; $i<strlen($string); $i++){
            for($j=0; $j<strlen($key); $j++){
                $string[$i] = $string[$i]^$key[$j];
            }
        }
        return $string;
    }

    /**
     * Simple XOR decryption
     *
     * @author Dustin Schneider
     * @link http://www.phpbuilder.com/tips/item.php?id=68
     */
    function x_Decrypt($string, $key){
        for($i=0; $i<strlen($string); $i++){
            for($j=0; $j<strlen($key); $j++){
                $string[$i] = $key[$j]^$string[$i];
            }
        }
        return $string;
    }
}

/**
* Main
*/

if($_REQUEST['MTC']['do'] == 'captcha'){
    $mtc = new MTC();
    $mtc->captcha_image();
}elseif($_REQUEST['MTC']['do'] == 'audio'){
    $mtc = new MTC();
    $mtc->captcha_audio();
}

//Setup VIM: ex: et ts=4 enc=utf-8 :
?>


page1.php

<?php
session_start();
?>

<table border="0" width="65%" style="border:1px solid #68B6DF">
				                  <tr>
						                <td>
						                      <?php 
												    require_once("mtc/mtc.class.php");
												    $MTC = new MTC();
												    $MTC->audio = true;
											  ?>
												<?php $MTC->comment_form(); ?>
												<?php echo $code=$_SESSION['cap'] ?>

												   </td>
				            	</tr>
			               </table>

Link to comment
https://forums.phpfreaks.com/topic/98134-captcha/
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ansarka Newbie

ansarka

Posted
Posted

change this code to

 

/**
     * Generate a 5 char random code
     */
    function _gen_rand(){
        $code = '';
        for($i=0;$i<5;$i++){
            $code .= chr(rand(65, 90));
        }
        return $code;
    }

 

change the to any number you want to have

Link to comment
https://forums.phpfreaks.com/topic/98134-captcha/#findComment-502012
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