Analysis on CodeIgniter framework verification code library files and usage

This article mainly introduces the CodeIgniter framework verification code class library file and usage. It analyzes the definition and specific usage of the CodeIgniter framework verification code class library file in the form of examples. It has certain reference value. Friends in need can refer to it.

The examples in this article describe the CodeIgniter framework verification code library files and usage. I would like to share it with you for your reference. The details are as follows:

After struggling with it for four or five hours, finally, the CI verification code library was successfully completed.

Please see the source code below:

Create the Authcode.php file in application/libraries, the code is as follows:

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/?';\n";
  echo "document.writeln('');";
 }
 /**
  * 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);
  }
 }
}

Authcode End of .php code

In Controller, there is an admin class, which has two methods:

Class Admin extends CI_Controller{
 function __construct()
 {
  parent::__construct();
  $this->load->library('Authcode');
 }
function captcha(){
  if($_POST){
    if ($this->authcode->check($this->input->post('gd_pic'))) {
    echo "right";
   } else {
    echo '验证码不正确，请重新输入';
   }
  }else{
   $this->load->view('demo');
  }
 }
 function show_captcha(){ //此方法用于显示验证码图片，归一个view中的img的src调用
  $this->authcode->show();
 }
}

The following is in the view view Create a demo.php with the following code:

OK. Everything is over and it finally runs normally.

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