Laravel verification code library-PHP Tutorial-php.cn

Laravel verification code library

韦小宝

Release： 2023-03-17 16:26:02

Original

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There are many image verification code libraries available in Laravel. This article introduces one of them Laravel: gregwar/captcha. This library is relatively simple. , more commonly used in Laravel. Let's introduce the usage details:

First, add the following configuration to composer.json:

"require": {
        ...
        "gregwar/captcha": "1.*"
    },

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Then, it has become a habit Command:

composer update

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Then you can use it normally. There are many ways to use it according to the specific development needs.

You can save the verification code image to a file:

<?php$builder->save(&#39;out.jpg&#39;);

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You can directly output the image to the web page:

<?php
header(&#39;Content-type: image/jpeg&#39;);
$builder->output();

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You can generate an inline image:

<img src="<?php echo $builder->inline(); ?>" />

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The following demonstrates one of the usage methods, directly outputting pictures to the web page.

Define a Controller:

<?php namespace App\Http\Controllers;
use App\Http\Requests;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;

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//Reference the corresponding namespace

use Gregwar\Captcha\CaptchaBuilder;
use Session;

class KitController extends Controller {

   /**
    * Display a listing of the resource.
    *
    * @return Response
    */
   public function captcha($tmp)
   {
       //生成验证码图片的Builder对象，配置相应属性
       $builder = new CaptchaBuilder;
       //可以设置图片宽高及字体
       $builder->build($width = 100, $height = 40, $font = null);
       //获取验证码的内容
       $phrase = $builder->getPhrase();

       //把内容存入session
       Session::flash(&#39;milkcaptcha&#39;, $phrase);
       //生成图片
       header("Cache-Control: no-cache, must-revalidate");
       header(&#39;Content-Type: image/jpeg&#39;);
       $builder->output();
   }
}

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Below we can set the corresponding router to access this verification Code the picture, modify router.php:

Route::get(&#39;kit/captcha/{tmp}&#39;, &#39;KitController@captcha&#39;);

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Now you can access and see this picture through the specific URL.

Verification code

It is relatively simple to write inside the form, just take a look:

<input type="text" name="captcha" class="form-control" style="width: 300px;">
<a onclick="javascript:re_captcha();" >
  <img src="{{ URL(&#39;kit/captcha/1&#39;) }}"  alt="验证码" title="刷新图片" 
       width="100" height="40" id="c2c98f0de5a04167a9e427d883690ff6" border="0"/>
</a>
<script>  
  function re_captcha() {
    $url = "{{ URL(&#39;kit/captcha&#39;) }}";
        $url = $url + "/" + Math.random();
        document.getElementById(&#39;c2c98f0de5a04167a9e427d883690ff6&#39;).src=$url;
  }
</script>

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The last step is to verify the corresponding verification code on the form submission page, which is also provided for us in the library The corresponding method:

$userInput = $request->get(&#39;captcha&#39;);
if($builder->testPhrase($userInput)) {
    //用户输入验证码正确
    return &#39;您输入验证码正确&#39;;
} else {
    //用户输入验证码错误
    return &#39;您输入验证码错误&#39;;
}

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At this point, the verification code is completed. The above is the usage process of Laravel's verification code library gregwar/captcha. If you are interested, go to PHP Chinese website to search for more~

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