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如何在 CodeIgniter 中使用验证码插件

发布于 2024-08-06 06:56:02 字数 13980 浏览 4 评论 0原文

我关注了这个页面，但代码在我的项目中无法正常工作。我试图找到有关如何执行我需要的内容的其他教程，但是，它在我的项目中也无法正常工作。有谁能指导我一个教程，详细解释如何在 CodeIgniter 中正确使用 Captcha 插件？

控制器：

<?php
class Prova extends Controller
{
    function prova()
    {
        parent :: Controller(); 

         $this -> load -> plugin( 'captcha' ); 

        $this->load->library('validation');
        $rules['user']    = "required";
        $rules['captcha']    = "required|callback_captcha_check";
        $this->validation->set_rules($rules);

        $fields['user']    = 'Username';
        $fields['captcha']    = 'codice';
        $this->validation->set_fields($fields);
        if ($this->validation->run() == FALSE)
        {
            $expiration = time()-300; // Two hour limit
            $this->db->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);
            $vals = array(
                        //'word'         => 'Random word',
                        'img_path'     => './tmp/captcha/',
                        'img_url'     => base_url().'tmp/captcha/',
                        'font_path'     => './system/fonts/texb.ttf',
                        'img_width'     => '100',
                        'img_height' => '30',
                        'expiration' => '3600'
                    );

            $cap = $this->captcha->create_captcha($vals);
            //
            $dati['image']= $cap['image'];
            //mette nel db
            $data = array(
                        'captcha_id'    => '',
                        'captcha_time'    => $cap['time'],
                        'ip_address'    => $this->input->ip_address(),
                        'word'            => $cap['word']
                    );

            $query = $this->db->insert_string('captcha', $data);
            $this->db->query($query);
            $this->load->view('captcha',$data);
        }else{
            echo "Captcha can't be made";
        }
        return $cap ['image'];
    }

    function captcha_check()
    {
            // Then see if a captcha exists:
            $exp=time()-600;
            $sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time > ?";
            $binds = array($this->input->post('captcha'), $this->input->ip_address(), $exp);
            $query = $this->db->query($sql, $binds);
            $row = $query->row();

            if ($row->count == 0)
            {
                $this->validation->set_message('_captcha_check', 'Codice di controllo non valido');
                return FALSE;
            }else{
                return TRUE;
            }

    }
}

视图：

<html>
<head>
<title>My Form</title>

</head>
<body>

<?=$this->validation->error_string; ?>

<?=form_open('XXXXXXXXX type your controller'); ?>

<h5>Username</h5>
<?=$this->validation->user_error; ?>
<input type="text" name="user" value="<?php echo ($this->validation->user) ;?>"  size="50" />
<br/>
<?=$image;?>
<br/>
<?=$this->validation->captcha_error; ?>
<input type="text" name="captcha" value="" />
<br/>
<div><input type="submit" value="Submit" /></div>

</form>

</body>
</html>

验证码：

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package     CodeIgniter
 * @author      ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008, EllisLab, Inc.
 * @license     http://codeigniter.com/user_guide/license.html
 * @link        http://codeigniter.com
 * @since       Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/*
Instructions:

Load the plugin using:

    $this->load->plugin('captcha');

Once loaded you can generate a captcha like this:

    $vals = array(
                    'word'       => 'Random word',
                    'img_path'   => './captcha/',
                    'img_url'    => 'http://example.com/captcha/',
                    'font_path'  => './system/fonts/texb.ttf',
                    'img_width'  => '150',
                    'img_height' => 30,
                    'expiration' => 7200
                );

    $cap = create_captcha($vals);
    echo $cap['image'];


NOTES:

    The captcha function requires the GD image library.

    Only the img_path and img_url are required.

    If a "word" is not supplied, the function will generate a random
    ASCII string.  You might put together your own word library that
    you can draw randomly from.

    If you do not specify a path to a TRUE TYPE font, the native ugly GD
    font will be used.

    The "captcha" folder must be writable (666, or 777)

    The "expiration" (in seconds) signifies how long an image will
    remain in the captcha folder before it will be deleted.  The default
    is two hours.

RETURNED DATA

The create_captcha() function returns an associative array with this data:

  [array]
  (
    'image' => IMAGE TAG
    'time'  => TIMESTAMP (in microtime)
    'word'  => CAPTCHA WORD
  )

The "image" is the actual image tag:
<img src="http://example.com/captcha/12345.jpg" width="140" height="50" />

The "time" is the micro timestamp used as the image name without the file
extension.  It will be a number like this:  1139612155.3422

The "word" is the word that appears in the captcha image, which if not
supplied to the function, will be a random string.


ADDING A DATABASE

In order for the captcha function to prevent someone from posting, you will need
to add the information returned from create_captcha() function to your database.
Then, when the data from the form is submitted by the user you will need to verify
that the data exists in the database and has not expired.

Here is a table prototype:

    CREATE TABLE captcha (
     captcha_id bigint(13) unsigned NOT NULL auto_increment,
     captcha_time int(10) unsigned NOT NULL,
     ip_address varchar(16) default '0' NOT NULL,
     word varchar(20) NOT NULL,
     PRIMARY KEY `captcha_id` (`captcha_id`),
     KEY `word` (`word`)
    )


Here is an example of usage with a DB.

On the page where the captcha will be shown you'll have something like this:

    $this->load->plugin('captcha');
    $vals = array(
                    'img_path'   => './captcha/',
                    'img_url'    => 'http://example.com/captcha/'
                );

    $cap = create_captcha($vals);

    $data = array(
                    'captcha_id'    => '',
                    'captcha_time'  => $cap['time'],
                    'ip_address'    => $this->input->ip_address(),
                    'word'          => $cap['word']
                );

    $query = $this->db->insert_string('captcha', $data);
    $this->db->query($query);

    echo 'Submit the word you see below:';
    echo $cap['image'];
    echo '<input type="text" name="captcha" value="" />';


Then, on the page that accepts the submission you'll have something like this:

    // First, delete old captchas
    $expiration = time()-7200; // Two hour limit
    $DB->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);        

    // Then see if a captcha exists:
    $sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND date > ?";
    $binds = array($_POST['captcha'], $this->input->ip_address(), $expiration);
    $query = $this->db->query($sql, $binds);
    $row = $query->row();

    if ($row->count == 0)
    {
        echo "You must submit the word that appears in the image";
    }

*/



/**
|==========================================================
| Create Captcha
|==========================================================
|
*/
function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
{       
    $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);        

    foreach ($defaults as $key => $val)
    {
        if ( ! is_array($data))
        {
            if ( ! isset($$key) OR $$key == '')
            {
                $$key = $val;
            }
        }
        else
        {           
            $$key = ( ! isset($data[$key])) ? $val : $data[$key];
        }
    }

    if ($img_path == '' OR $img_url == '')
    {
        return FALSE;
    }

    if ( ! @is_dir($img_path))
    {
        return FALSE;
    }

    if ( ! is_really_writable($img_path))
    {
        return FALSE;
    }

    if ( ! extension_loaded('gd'))
    {
        return FALSE;
    }       

    // -----------------------------------
    // Remove old images    
    // -----------------------------------

    list($usec, $sec) = explode(" ", microtime());
    $now = ((float)$usec + (float)$sec);

    $current_dir = @opendir($img_path);

    while($filename = @readdir($current_dir))
    {
        if ($filename != "." and $filename != ".." and $filename != "index.html")
        {
            $name = str_replace(".jpg", "", $filename);

            if (($name + $expiration) < $now)
            {
                @unlink($img_path.$filename);
            }
        }
    }

    @closedir($current_dir);

    // -----------------------------------
    // Do we have a "word" yet?
    // -----------------------------------

   if ($word == '')
   {
        $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

        $str = '';
        for ($i = 0; $i < 8; $i++)
        {
            $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
        }

        $word = $str;
   }

    // -----------------------------------
    // Determine angle and position 
    // -----------------------------------

    $length = strlen($word);
    $angle  = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
    $x_axis = rand(6, (360/$length)-16);            
    $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);

    // -----------------------------------
    // Create image
    // -----------------------------------

    // PHP.net recommends imagecreatetruecolor(), but it isn't always available
    if (function_exists('imagecreatetruecolor'))
    {
        $im = imagecreatetruecolor($img_width, $img_height);
    }
    else
    {
        $im = imagecreate($img_width, $img_height);
    }

    // -----------------------------------
    //  Assign colors
    // -----------------------------------

    $bg_color       = imagecolorallocate ($im, 255, 255, 255);
    $border_color   = imagecolorallocate ($im, 153, 102, 102);
    $text_color     = imagecolorallocate ($im, 204, 153, 153);
    $grid_color     = imagecolorallocate($im, 255, 182, 182);
    $shadow_color   = imagecolorallocate($im, 255, 240, 240);

    // -----------------------------------
    //  Create the rectangle
    // -----------------------------------

    ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);

    // -----------------------------------
    //  Create the spiral pattern
    // -----------------------------------

    $theta      = 1;
    $thetac     = 7;
    $radius     = 16;
    $circles    = 20;
    $points     = 32;

    for ($i = 0; $i < ($circles * $points) - 1; $i++)
    {
        $theta = $theta + $thetac;
        $rad = $radius * ($i / $points );
        $x = ($rad * cos($theta)) + $x_axis;
        $y = ($rad * sin($theta)) + $y_axis;
        $theta = $theta + $thetac;
        $rad1 = $radius * (($i + 1) / $points);
        $x1 = ($rad1 * cos($theta)) + $x_axis;
        $y1 = ($rad1 * sin($theta )) + $y_axis;
        imageline($im, $x, $y, $x1, $y1, $grid_color);
        $theta = $theta - $thetac;
    }

    // -----------------------------------
    //  Write the text
    // -----------------------------------

    $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;

    if ($use_font == FALSE)
    {
        $font_size = 5;
        $x = rand(0, $img_width/($length/3));
        $y = 0;
    }
    else
    {
        $font_size  = 16;
        $x = rand(0, $img_width/($length/1.5));
        $y = $font_size+2;
    }

    for ($i = 0; $i < strlen($word); $i++)
    {
        if ($use_font == FALSE)
        {
            $y = rand(0 , $img_height/2);
            imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
            $x += ($font_size*2);
        }
        else
        {       
            $y = rand($img_height/2, $img_height-3);
            imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
            $x += $font_size;
        }
    }


    // -----------------------------------
    //  Create the border
    // -----------------------------------

    imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);      

    // -----------------------------------
    //  Generate the image
    // -----------------------------------

    $img_name = $now.'.jpg';

    ImageJPEG($im, $img_path.$img_name);

    $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";

    ImageDestroy($im);

    return array('word' => $word, 'time' => $now, 'image' => $img);
}


/* End of file captcha_pi.php */
/* Location: ./system/plugins/captcha_pi.php */
原文

I followed this page, and the code is not working as it should in my project. I've tried to find other tutorial on how to execute what I need, however, it does not work as it should in my project either. Is anyone able to direct me to a tutorial that explains in a detailed fashion on how to use Captcha plug-in properly in CodeIgniter?

Controller:

<?php
class Prova extends Controller
{
    function prova()
    {
        parent :: Controller(); 

         $this -> load -> plugin( 'captcha' ); 

        $this->load->library('validation');
        $rules['user']    = "required";
        $rules['captcha']    = "required|callback_captcha_check";
        $this->validation->set_rules($rules);

        $fields['user']    = 'Username';
        $fields['captcha']    = 'codice';
        $this->validation->set_fields($fields);
        if ($this->validation->run() == FALSE)
        {
            $expiration = time()-300; // Two hour limit
            $this->db->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);
            $vals = array(
                        //'word'         => 'Random word',
                        'img_path'     => './tmp/captcha/',
                        'img_url'     => base_url().'tmp/captcha/',
                        'font_path'     => './system/fonts/texb.ttf',
                        'img_width'     => '100',
                        'img_height' => '30',
                        'expiration' => '3600'
                    );

            $cap = $this->captcha->create_captcha($vals);
            //
            $dati['image']= $cap['image'];
            //mette nel db
            $data = array(
                        'captcha_id'    => '',
                        'captcha_time'    => $cap['time'],
                        'ip_address'    => $this->input->ip_address(),
                        'word'            => $cap['word']
                    );

            $query = $this->db->insert_string('captcha', $data);
            $this->db->query($query);
            $this->load->view('captcha',$data);
        }else{
            echo "Captcha can't be made";
        }
        return $cap ['image'];
    }

    function captcha_check()
    {
            // Then see if a captcha exists:
            $exp=time()-600;
            $sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND captcha_time > ?";
            $binds = array($this->input->post('captcha'), $this->input->ip_address(), $exp);
            $query = $this->db->query($sql, $binds);
            $row = $query->row();

            if ($row->count == 0)
            {
                $this->validation->set_message('_captcha_check', 'Codice di controllo non valido');
                return FALSE;
            }else{
                return TRUE;
            }

    }
}

View:

<html>
<head>
<title>My Form</title>

</head>
<body>

<?=$this->validation->error_string; ?>

<?=form_open('XXXXXXXXX type your controller'); ?>

<h5>Username</h5>
<?=$this->validation->user_error; ?>
<input type="text" name="user" value="<?php echo ($this->validation->user) ;?>"  size="50" />
<br/>
<?=$image;?>
<br/>
<?=$this->validation->captcha_error; ?>
<input type="text" name="captcha" value="" />
<br/>
<div><input type="submit" value="Submit" /></div>

</form>

</body>
</html>

Captcha:

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package     CodeIgniter
 * @author      ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008, EllisLab, Inc.
 * @license     http://codeigniter.com/user_guide/license.html
 * @link        http://codeigniter.com
 * @since       Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/*
Instructions:

Load the plugin using:

    $this->load->plugin('captcha');

Once loaded you can generate a captcha like this:

    $vals = array(
                    'word'       => 'Random word',
                    'img_path'   => './captcha/',
                    'img_url'    => 'http://example.com/captcha/',
                    'font_path'  => './system/fonts/texb.ttf',
                    'img_width'  => '150',
                    'img_height' => 30,
                    'expiration' => 7200
                );

    $cap = create_captcha($vals);
    echo $cap['image'];


NOTES:

    The captcha function requires the GD image library.

    Only the img_path and img_url are required.

    If a "word" is not supplied, the function will generate a random
    ASCII string.  You might put together your own word library that
    you can draw randomly from.

    If you do not specify a path to a TRUE TYPE font, the native ugly GD
    font will be used.

    The "captcha" folder must be writable (666, or 777)

    The "expiration" (in seconds) signifies how long an image will
    remain in the captcha folder before it will be deleted.  The default
    is two hours.

RETURNED DATA

The create_captcha() function returns an associative array with this data:

  [array]
  (
    'image' => IMAGE TAG
    'time'  => TIMESTAMP (in microtime)
    'word'  => CAPTCHA WORD
  )

The "image" is the actual image tag:
<img src="http://example.com/captcha/12345.jpg" width="140" height="50" />

The "time" is the micro timestamp used as the image name without the file
extension.  It will be a number like this:  1139612155.3422

The "word" is the word that appears in the captcha image, which if not
supplied to the function, will be a random string.


ADDING A DATABASE

In order for the captcha function to prevent someone from posting, you will need
to add the information returned from create_captcha() function to your database.
Then, when the data from the form is submitted by the user you will need to verify
that the data exists in the database and has not expired.

Here is a table prototype:

    CREATE TABLE captcha (
     captcha_id bigint(13) unsigned NOT NULL auto_increment,
     captcha_time int(10) unsigned NOT NULL,
     ip_address varchar(16) default '0' NOT NULL,
     word varchar(20) NOT NULL,
     PRIMARY KEY `captcha_id` (`captcha_id`),
     KEY `word` (`word`)
    )


Here is an example of usage with a DB.

On the page where the captcha will be shown you'll have something like this:

    $this->load->plugin('captcha');
    $vals = array(
                    'img_path'   => './captcha/',
                    'img_url'    => 'http://example.com/captcha/'
                );

    $cap = create_captcha($vals);

    $data = array(
                    'captcha_id'    => '',
                    'captcha_time'  => $cap['time'],
                    'ip_address'    => $this->input->ip_address(),
                    'word'          => $cap['word']
                );

    $query = $this->db->insert_string('captcha', $data);
    $this->db->query($query);

    echo 'Submit the word you see below:';
    echo $cap['image'];
    echo '<input type="text" name="captcha" value="" />';


Then, on the page that accepts the submission you'll have something like this:

    // First, delete old captchas
    $expiration = time()-7200; // Two hour limit
    $DB->query("DELETE FROM captcha WHERE captcha_time < ".$expiration);        

    // Then see if a captcha exists:
    $sql = "SELECT COUNT(*) AS count FROM captcha WHERE word = ? AND ip_address = ? AND date > ?";
    $binds = array($_POST['captcha'], $this->input->ip_address(), $expiration);
    $query = $this->db->query($sql, $binds);
    $row = $query->row();

    if ($row->count == 0)
    {
        echo "You must submit the word that appears in the image";
    }

*/



/**
|==========================================================
| Create Captcha
|==========================================================
|
*/
function create_captcha($data = '', $img_path = '', $img_url = '', $font_path = '')
{       
    $defaults = array('word' => '', 'img_path' => '', 'img_url' => '', 'img_width' => '150', 'img_height' => '30', 'font_path' => '', 'expiration' => 7200);        

    foreach ($defaults as $key => $val)
    {
        if ( ! is_array($data))
        {
            if ( ! isset($key) OR $key == '')
            {
                $key = $val;
            }
        }
        else
        {           
            $key = ( ! isset($data[$key])) ? $val : $data[$key];
        }
    }

    if ($img_path == '' OR $img_url == '')
    {
        return FALSE;
    }

    if ( ! @is_dir($img_path))
    {
        return FALSE;
    }

    if ( ! is_really_writable($img_path))
    {
        return FALSE;
    }

    if ( ! extension_loaded('gd'))
    {
        return FALSE;
    }       

    // -----------------------------------
    // Remove old images    
    // -----------------------------------

    list($usec, $sec) = explode(" ", microtime());
    $now = ((float)$usec + (float)$sec);

    $current_dir = @opendir($img_path);

    while($filename = @readdir($current_dir))
    {
        if ($filename != "." and $filename != ".." and $filename != "index.html")
        {
            $name = str_replace(".jpg", "", $filename);

            if (($name + $expiration) < $now)
            {
                @unlink($img_path.$filename);
            }
        }
    }

    @closedir($current_dir);

    // -----------------------------------
    // Do we have a "word" yet?
    // -----------------------------------

   if ($word == '')
   {
        $pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

        $str = '';
        for ($i = 0; $i < 8; $i++)
        {
            $str .= substr($pool, mt_rand(0, strlen($pool) -1), 1);
        }

        $word = $str;
   }

    // -----------------------------------
    // Determine angle and position 
    // -----------------------------------

    $length = strlen($word);
    $angle  = ($length >= 6) ? rand(-($length-6), ($length-6)) : 0;
    $x_axis = rand(6, (360/$length)-16);            
    $y_axis = ($angle >= 0 ) ? rand($img_height, $img_width) : rand(6, $img_height);

    // -----------------------------------
    // Create image
    // -----------------------------------

    // PHP.net recommends imagecreatetruecolor(), but it isn't always available
    if (function_exists('imagecreatetruecolor'))
    {
        $im = imagecreatetruecolor($img_width, $img_height);
    }
    else
    {
        $im = imagecreate($img_width, $img_height);
    }

    // -----------------------------------
    //  Assign colors
    // -----------------------------------

    $bg_color       = imagecolorallocate ($im, 255, 255, 255);
    $border_color   = imagecolorallocate ($im, 153, 102, 102);
    $text_color     = imagecolorallocate ($im, 204, 153, 153);
    $grid_color     = imagecolorallocate($im, 255, 182, 182);
    $shadow_color   = imagecolorallocate($im, 255, 240, 240);

    // -----------------------------------
    //  Create the rectangle
    // -----------------------------------

    ImageFilledRectangle($im, 0, 0, $img_width, $img_height, $bg_color);

    // -----------------------------------
    //  Create the spiral pattern
    // -----------------------------------

    $theta      = 1;
    $thetac     = 7;
    $radius     = 16;
    $circles    = 20;
    $points     = 32;

    for ($i = 0; $i < ($circles * $points) - 1; $i++)
    {
        $theta = $theta + $thetac;
        $rad = $radius * ($i / $points );
        $x = ($rad * cos($theta)) + $x_axis;
        $y = ($rad * sin($theta)) + $y_axis;
        $theta = $theta + $thetac;
        $rad1 = $radius * (($i + 1) / $points);
        $x1 = ($rad1 * cos($theta)) + $x_axis;
        $y1 = ($rad1 * sin($theta )) + $y_axis;
        imageline($im, $x, $y, $x1, $y1, $grid_color);
        $theta = $theta - $thetac;
    }

    // -----------------------------------
    //  Write the text
    // -----------------------------------

    $use_font = ($font_path != '' AND file_exists($font_path) AND function_exists('imagettftext')) ? TRUE : FALSE;

    if ($use_font == FALSE)
    {
        $font_size = 5;
        $x = rand(0, $img_width/($length/3));
        $y = 0;
    }
    else
    {
        $font_size  = 16;
        $x = rand(0, $img_width/($length/1.5));
        $y = $font_size+2;
    }

    for ($i = 0; $i < strlen($word); $i++)
    {
        if ($use_font == FALSE)
        {
            $y = rand(0 , $img_height/2);
            imagestring($im, $font_size, $x, $y, substr($word, $i, 1), $text_color);
            $x += ($font_size*2);
        }
        else
        {       
            $y = rand($img_height/2, $img_height-3);
            imagettftext($im, $font_size, $angle, $x, $y, $text_color, $font_path, substr($word, $i, 1));
            $x += $font_size;
        }
    }


    // -----------------------------------
    //  Create the border
    // -----------------------------------

    imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $border_color);      

    // -----------------------------------
    //  Generate the image
    // -----------------------------------

    $img_name = $now.'.jpg';

    ImageJPEG($im, $img_path.$img_name);

    $img = "<img src=\"$img_url$img_name\" width=\"$img_width\" height=\"$img_height\" style=\"border:0;\" alt=\" \" />";

    ImageDestroy($im);

    return array('word' => $word, 'time' => $now, 'image' => $img);
}


/* End of file captcha_pi.php */
/* Location: ./system/plugins/captcha_pi.php */

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去了角落 2024-08-13 06:56:02

整个教程都在 captcha_pi 文件中。 wiki 中的验证码教程适用于不同的脚本（类）。

The whole tutorial is in the captcha_pi file. The captcha tutorial in the wiki works on a different script (a class).

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