0

我正在使用验证码组件。

<?php

function create($width='120',$height='40',$characters='6') {

    $code = $this->generateCode($characters); 

    /* font size will be 75% of the image height */
    $font_size = $height * 0.70;

    $image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');

    /* set the colours */
    $background_color = imagecolorallocate($image, 220, 220, 220);               
    $text_color       = imagecolorallocate($image, 10, 30, 80);
    $noise_color      = imagecolorallocate($image, 150, 180, 220);

    /* generate random dots in background */
    for( $i=0; $i<($width*$height)/3; $i++ ) {
        imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
    }

    /* generate random lines in background */
    for( $i=0; $i<($width*$height)/150; $i++ ) {
        imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
    }

    /* create textbox and add text */
    $textbox = imagettfbbox($font_size, 0, dirname(__FILE__).'/'.$this->font, $code) or die('Error in imagettfbbox function');
    $x       = ($width - $textbox[4])/2;
    $y       = ($height - $textbox[5])/2;
    $y       -= 5;
    imagettftext($image, $font_size, 0, $x, $y, $text_color, dirname(__FILE__).'/'.$this->font , $code) or die('Error in imagettftext function');

    /* output captcha image to browser */
    header('Content-Type: image/jpeg');
    imagejpeg($image);
    imagedestroy($image);

    $this->Controller->Session->write('security_code',$code);
}

captca 已成功创建，但是当我尝试验证它时出现错误，因为$code它没有存储在会话中。我不明白为什么会这样。

4

3 回答 3

0

改变：

$this->Controller->Session->write('security_code', $code);

对此：

$this->Session->write('security_code', $code);

此外，请确保您已将 SessionHelper 添加到 $helpers 数组中。

于 2012-12-09T20:11:49.933 回答
0

如果您使用的是 CakePHP 1.x，您的应用程序似乎在调用 header() 函数以生成图像之前将输出发送到浏览器。在这种情况下，您需要将会话创建行移至header('Content-Type: image/jpeg'); 如下所示：

imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
/* output captcha image to browser */
$this->Controller->Session->write('security_code',$code);
@ob_end_clean(); //clean buffers, as a fix for 'headers already sent errors..'
header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);

如果您使用的是 CakePHP 2.x，请从作者的网站 www.devarticles.in/cakephp/simple-captcha-component-for-cakephp/ 下载更新版本的验证码组件

于 2013-04-15T07:21:13.997 回答
0

我遇到了一些问题，并通过更改会话存储线的位置来解决这个问题

function create($width='120',$height='40',$characters='6') {

    $code = $this->generateCode($characters); 
    $this->Controller->Session->write('security_code',$code);

    //.....rest of code will remain same
}
于 2013-04-15T12:48:51.837 回答