How ThinkPHP implements the function of generating and verifying verification codes

This article mainly introduces the function of generating and verifying verification codes through ThinkPHP in detail. It has certain reference value. Interested friends can refer to

Using ThinkPHP to realize generation/verification. The verification code function is for your reference. The specific content is as follows

First understand some functions in the parent class Verity.class.php (ThinkPHP/Library/Think/Verity.class.php)

1:check() Verify whether the verification code is correct

2:entry() output the verification code and save the value of the verification code in the session

3:authcode() encrypted verification Code (this method is called in the check() method)

ControllerGenerate verification codeCode:

//验证码
 function verifyImg(){

  //验证码配置
  $cfg = array(
   'imageH' => 30, // 验证码图片高度
   'imageW' => 100, // 验证码图片宽度
   'fontSize' => 15, // 验证码字体大小(px)
   'length' => 4, // 验证码位数
   'fontttf' => '4.ttf', // 验证码字体，不设置随机获取
  );

  //实例化Verify类 自动调用构造函数，把$cfg信息传给$config
  $verify = new Verify($cfg);
  $verify -> entry(); //输出验证码
 }

Verification code displayed at the front desk

Copy code The code is as follows:

ControllerVerify verification code (take login as an example)

//登陆
 function login(){
  
  //两个逻辑：展示，收集
  if (!empty($_POST)) {

   $verify = new Verify();

   //接收验证码
   $captcha = $_POST['captcha'];
   //check()方法校验验证码
   if ($verify->check($captcha)) {
    echo "正确";
   }else{
    echo "错误";
   }
  }

  //调用view视图
  $this->display();
 }

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