Captcha使用PHP＆amp; amp;渲染为破碎的文本而不是图像。 GD

时间：2014-03-18 15:18:15

标签： php apache png gd

我在应用程序中使用此Kohana Captcha module。图像在我的本地环境中正确呈现，但在我们的开发环境中，它返回以下内容：

�PNG


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这是render（）方法：

public function render($html = TRUE)
{
    // Creates $this->image
    $this->image_create(Captcha::$config['background']);

    // Add a random gradient
    if (empty(Captcha::$config['background']))
    {
        $color1 = imagecolorallocate($this->image, mt_rand(200, 255), mt_rand(200, 255), mt_rand(150, 255));
        $color2 = imagecolorallocate($this->image, mt_rand(200, 255), mt_rand(200, 255), mt_rand(150, 255));
        $this->image_gradient($color1, $color2);
    }

    // Add a few random lines
    for ($i = 0, $count = mt_rand(5, Captcha::$config['complexity'] * 4); $i < $count; $i++)
    {
        $color = imagecolorallocatealpha($this->image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(100, 255), mt_rand(50, 120));
        imageline($this->image, mt_rand(0, Captcha::$config['width']), 0, mt_rand(0, Captcha::$config['width']), Captcha::$config['height'], $color);
    }

    // Calculate character font-size and spacing
    $default_size = min(Captcha::$config['width'], Captcha::$config['height'] * 2) / (utf8::strlen($this->response) + 1);
    $spacing = (int) (Captcha::$config['width'] * 0.9 / utf8::strlen($this->response));

    // Draw each Captcha character with varying attributes
    for ($i = 0, $strlen = utf8::strlen($this->response); $i < $strlen; $i++)
    {
        // Use different fonts if available
        $font = Captcha::$config['fontpath'].Captcha::$config['fonts'][array_rand(Captcha::$config['fonts'])];

        // Allocate random color, size and rotation attributes to text
        $color = imagecolorallocate($this->image, mt_rand(0, 150), mt_rand(0, 150), mt_rand(0, 150));
        $angle = mt_rand(-40, 20);

        // Scale the character size on image height
        $size = $default_size / 10 * mt_rand(8, 12);
        $box = imageftbbox($size, $angle, $font, utf8::substr($this->response, $i, 1));

        // Calculate character starting coordinates
        $x = $spacing / 4 + $i * $spacing;
        $y = Captcha::$config['height'] / 2 + ($box[2] - $box[5]) / 4;

        // Write text character to image
        imagefttext($this->image, $size, $angle, $x, $y, $color, $font, utf8::substr($this->response, $i, 1));
    }

    // Output
    return $this->image_render($html);
}

和image_render（）

/**
 * Returns the img html element or outputs the image to the browser.
 *
 * @param boolean $html Output as HTML
 * @return mixed HTML, string or void
 */
public function image_render($html)
{
    // Output html element
    if ($html === TRUE)
        return '<img src="'.url::site('captcha/'.Captcha::$config['group']).'" width="'.Captcha::$config['width'].'" height="'.Captcha::$config['height'].'" alt="Captcha" class="captcha" />';

    // Send the correct HTTP header
    Request::current()->headers('Content-Type', 'image/'.$this->image_type)
        ->headers('Cache-Control', 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0')
        ->headers('Pragma', 'no-cache')
        ->headers('Connection', 'close');

    // Pick the correct output function
    $function = 'image'.$this->image_type;
    $function($this->image);

    // Free up resources
    imagedestroy($this->image);
}

在开发环境中启用了GD库。这两个环境都使用apache 2.2，php 5.4。我需要启用另一个服务器设置吗？

2 个答案:

答案 0 :(得分：0)

这种类型的错误有时会让我感到烦恼，请尝试添加：     模具（）;

在最后一行之后：     返回$ this-＆gt; image_render（$ html）;

有时它对我有用。

答案 1 :(得分：0)

文本看起来像PNG数据流，只能由文本编辑器而不是图像查看器呈现。

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