CodeIgniter框架验证码类库文件与用法示例

  <?php

  class Authcode

  {

  var $CI;

  var $fontPath;//字体路径

  var $image;

  var $charLen = 4; //生成几位验证码

  var $arrChr = array();//验证码字符

  var $width = 83; //图片宽

  var $height = 24; //图片高

  var $bgcolor = "#ffffff"; //背景色

  var $showNoisePix = true; //生成杂点

  var $noiseNumPix = 80; //生成杂点数量

  var $showNoiseLine = true; //生成杂线

  var $noiseNumLine = 2; //生成杂线数量

  var $showBorder = true; //边框,当杂点、线一起作用的时候,边框容易受干扰

  var $borderColor = "#000000";

  function Authcode()

  {

  $this->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 < $this->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 img_src = '/imgauthcode/show/?';

  ";

  echo "document.writeln('点击更换图片');";

  }

  /**

  * 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 < $this->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 < $this->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);

  }

  }

  }