How to perform captcha graphic verification code operation in ThinkPHP6?

With the rapid development of the Internet, graphic-based verification codes have become an important part of website security. Verification codes can effectively prevent robots or malicious programs from automating operations on the website, and can also ensure the security of user information. In website development based on ThinkPHP6, how to implement the operation of captcha graphic verification code? This article will introduce you to the specific operation process.

1. Generate Captcha graphic verification code

1. Install using captcha library

To perform captcha graphic verification code operation in ThinkPHP6, we first need to use captcha library. It can be installed through composer. Add:

"require": {
    "topthink/think-captcha": "^3.1"
}

to the composer.json file in the project root directory, and then run:

composer update

through the command line tool to complete the installation of the captcha library.

2. Generate verification code data

When we need to generate a verification code, we can create a new controller to call the relevant methods of the captcha library. First, we need to introduce the captcha library into the controller:

use thinkcaptchaacadeCaptcha;

Then call the Captcha::create() method to generate the verification code image. The code example is as follows:

public function create()
{
    return Captcha::create();
}

At this time, access the corresponding URL, you can see the generated verification code image.

3. Customized verification code parameters

We can also customize some settings of the verification code through parameters, such as verification code length, verification code image width, verification code image height, etc. An example is as follows:

public function create()
{
    return Captcha::create('abcde', 3, 120, 36);
}

In the above code, 'abcde' represents the optional character set of the verification code, 3 represents the length of the verification code, 120 and 36 are the width and height of the verification code image respectively. After completing the settings, visit the corresponding URL again and you will see the verification code image generated by the customized settings.

2. Verify the Captcha graphic verification code

After generating the verification code, we also need to verify the verification code entered by the user to ensure that the input is correct. Similarly, we can use the method provided by the captcha library for verification. In the controller, call the Captcha::check() method to verify the entered verification code. An example is as follows:

public function check($code)
{
    if (Captcha::check($code)) {
        return '验证成功';
    } else {
        return '验证失败';
    }
}

Among them, $code represents the verification code entered by the user. If the verification code is entered correctly, "Verification Success" will be returned, otherwise "Verification Failure" will be returned.

It should be noted that when performing verification code verification, the case needs to be compared with the verification code entered by the user, otherwise the verification will fail. We can set case-sensitive options in the configuration file, for example:

'captcha' => [
    'reset' => true,
    'useZh' => false,
    'codeSet' => '0123456789',
    'fontSize' => 25,
    'useCurve' => false,
    'useNoise' => false,
    'imageH' => 0,
    'imageW' => 0,
    'length' => 4,
    'bg' => [243, 251, 254],
    'fontttf' => '',
    'expire' => 1800,
    'defaultCode' => '',
    'seKey' => 'thinkphp_captcha',
    'offset' => null,
    'verifyCode' => true,
    'resetCode' => true,
    'keyPrefix' => '',
    'checkSensitive' => true, // 验证码大小写敏感
],

Among them, 'checkSensitive' => true means that the verification code is case-sensitive.

The above is the method of performing captcha graphic verification code operation in ThinkPHP6, which is suitable for various website development scenarios. Hope it helps.

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