CodeIgniter框架验证码类库文件与用法示例

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            本文实例讲述了CodeIgniter框架验证码类库文件与用法。分享给大家供大家参考，具体如下：
折腾了我四五个小时，终于，ci的验证码类库成功的整出来了。
下面请看源码：
在application/libraries建立Authcode.php文件，代码如下：
CI = & get_instance();
  $this->fontPath = realpath(dirname(__FILE__) . '/fonts/'); //字体文件
  //$this->arrChr   = array_merge(range(1, 9) , range('A', 'Z'));//数字字母验证码
  //$this->arrChr   = range('A', 'Z');//纯字母验证码
  $this->arrChr = range(0, 9);//纯数字验证码
}
/**
  * 显示验证码
  *
  */
function show()
{
  $this->image = imageCreate($this->width, $this->height);
  $this->back = $this->getColor($this->bgcolor);
  imageFilledRectangle($this->image, 0, 0, $this->width, $this->height, $this->back);
  $size = $this->width / $this->charLen - 4;
  if ($size > $this->height) {
   $size = $this->height;
  }
  $left = ($this->width - $this->charLen * ($size + $size / 10)) / $size + 5;
  $code = '';
  for($i = 0; $i charLen; $i ++) {
   $randKey = rand(0, count($this->arrChr) - 1);
   $randText = $this->arrChr[$randKey];
   $code .= $randText;
   $textColor = imageColorAllocate($this->image, rand(0, 100), rand(0, 100), rand(0, 100));
   $font = $this->fontPath . '/' . rand(1, 5) . ".ttf";
   $randsize = rand($size - $size / 10, $size + $size / 10);
   $location = $left + ($i * $size + $size / 10);
   @imagettftext($this->image, $randsize, rand(- 18, 18), $location, rand($size - $size / 10, $size + $size / 10) + 2, $textColor, $font, $randText);
  }
  if ($this->showNoisePix == true) {
   $this->setNoisePix();
  }
  if ($this->showNoiseLine == true) {
   $this->setNoiseLine();
  }
  if ($this->showBorder == true) {
   $this->borderColor = $this->getColor($this->borderColor);
   imageRectangle($this->image, 0, 0, $this->width - 1, $this->height - 1, $this->borderColor);
  }
  $this->CI->session->set_userdata('auth_code', $code);
  ob_clean();
  header("Content-type: image/jpeg");
  imagejpeg($this->image);
  imagedestroy($this->image);
}
/**
  * 显示验证码的JS调用
  *
  */
function showScript()
{
  //显示验证码
  echo "var '/';\n";
  echo "document.writeln('
[img][/img]
');";
}
/**
  * 检查验证码是否正确
  *
  * @param string $auth_code
  * @return bool
  */
function check($auth_code = null)
{
  return ($this->CI->session->userdata('auth_code') && $auth_code) ? ($this->CI->session->userdata('auth_code') === $auth_code) : false;
}
function getColor($color)
{
  $color = eregi_replace("^#", "", $color);
  $r = $color[0] . $color[1];
  $r = hexdec($r);
  $b = $color[2] . $color[3];
  $b = hexdec($b);
  $g = $color[4] . $color[5];
  $g = hexdec($g);
  $color = imagecolorallocate($this->image, $r, $b, $g);
  return $color;
}
function setNoisePix()
{
  for($i = 0; $i noiseNumPix; $i ++) {
   $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
   imageSetPixel($this->image, rand(0, $this->width), rand(0, $this->height), $randColor);
  }
}
function setNoiseLine()
{
  for($i = 0; $i noiseNumLine; $i ++) {
   $randColor = imageColorAllocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));
   imageline($this->image, rand(1, $this->width), rand(1, $this->height), rand(1, $this->width), rand(1, $this->height), $randColor);
  }
}
}