thinkphp5 verification code failed

ThinkPHP5 is a PHP framework developed based on the MVC model. It is easy to use and powerful, and is widely used in enterprise-level Web application development.

The verification code function is one of the more commonly used security verification functions, but in the actual development process, many people will encounter situations where the verification code does not take effect or the verification fails. Let's analyze the possible causes and solutions to these situations.

1. The problem that the verification code is not displayed

First of all, you should check whether the verification code plug-in has been correctly introduced.

In ThinkPHP5, the verification code plug-in is located in the thinkcaptcha directory and can be introduced through the following code:

use thinkcaptchaCaptcha;

//显示验证码
public function verify(){
    $captcha = new Captcha();
    return $captcha->entry();
}

Add the verification code in the HTML code at the front end:

<img src="{:captcha_src()}" alt="captcha" onclick="this.src='{:captcha_src()}?t='+Math.random();">

If If the verification code still cannot be displayed normally, it may be a cache problem. You can clear the browser cache or try to use another browser for testing.

2. The problem of verification code verification failure

If you make sure that the verification code has been displayed correctly, but the verification code error is prompted during verification, you need to check the following points:

2.1 Are the form parameter names submitted during verification code verification correct?

By default, the ThinkPHP5 verification code plug-in will generate a POST parameter named captcha to store the verification code value. If verification fails, error information in JSON format needs to be returned. Therefore, when verifying, you need to ensure that the parameter name submitted in the form is also captcha, for example:

//验证验证码
if (!captcha_check(input('post.captcha'))) {
    return json([
        'status' => '0',
        'msg' => '验证码错误！'
    ]);
}

2.2 Verification code is not case-sensitive

The verification code is case-sensitive by default. Therefore, when checking the verification code, you need to ensure that the verification code entered is exactly the same as the verification code generated. If you want the verification code to be case-insensitive, you can add parameters when calling the captcha() method, for example:

$captcha = new Captcha(['useZh' => false, 'useImgBg' => true, 'fontSize' => 20, 'useNoise' => true, 'length' => 4, 'useCurve' => false, 'fontttf' => '4.ttf', 'bg' => [151, 232, 66], 'reset' => true, 'codeSet' => '0123456789', 'expire' => 300, 'zhSet' => '']);

In the above parameters, the useZh parameter is used to display the Chinese verification code, and the useImgBg and useNoise parameters are used For generating background images and noise, the length parameter indicates the length of the verification code, the codeSet parameter sets the verification code character set, and the expire parameter sets the expiration time of the verification code. Note that zhSet is set to an empty string here, which means that Chinese verification codes are not enabled.

2.3 Verification code and form submission on the same page

If the verification code and form submission are on the same page, and the verification operation needs to be submitted through Ajax, it may cause problems due to cross-domain, session failure, etc. The reason is that the verification code cannot be successfully verified. At this time, Access-Control-Allow-Origin needs to be set in a cross-domain environment, for example:

header('Access-Control-Allow-Origin: *');

You also need to ensure that the session is passed, you can add:

header('P3P: CP=CAO PSA OUR');
session_start();

before session_start() You can carefully read the section about the verification code plug-in in the ThinkPHP5 manual, or search for related questions in the official forum to get more solutions and tips for this problem.

In short, when designing and implementing verification codes, it is necessary to weigh and balance between security and user experience, follow common design principles and best practices, and use checked third-party components and libraries to ensure the reliability and validity of the verification code.

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