041.CI4框架CodeIgniter,控制器过滤器Filter的使用

01、我们在Filters目录，创建一个MyFilter.php文件

<?php

namespace App\Filters;

use CodeIgniter\Filters\FilterInterface;
use CodeIgniter\HTTP\RequestInterface;
use CodeIgniter\HTTP\ResponseInterface;

class MyFilter implements FilterInterface
{
    public function before(RequestInterface $request, $arguments = null)
    {
        echo '我是Filter中的一句话。';
        //加上这一句，就不往下执行了
        //exit;
    }

    public function after(RequestInterface $request, ResponseInterface $response, $arguments = null)
    {
        // Do something here
    }
}

02、在app/Config/Filters.php目录，加上

 03、代码如下：

<?php

namespace Config;

use CodeIgniter\Config\Filters as BaseFilters;
use CodeIgniter\Filters\Cors;
use CodeIgniter\Filters\CSRF;
use CodeIgniter\Filters\DebugToolbar;
use CodeIgniter\Filters\ForceHTTPS;
use CodeIgniter\Filters\Honeypot;
use CodeIgniter\Filters\InvalidChars;
use CodeIgniter\Filters\PageCache;
use CodeIgniter\Filters\PerformanceMetrics;
use CodeIgniter\Filters\SecureHeaders;

class Filters extends BaseFilters
{
    /**
     * Configures aliases for Filter classes to
     * make reading things nicer and simpler.
     *
     * @var array<string, class-string|list<class-string>>
     *
     * [filter_name => classname]
     * or [filter_name => [classname1, classname2, ...]]
     */
    public array $aliases = [
        // 注册的过滤器
        'myfilter' => \App\Filters\MyFilter::class,
        'csrf' => CSRF::class,
        'toolbar' => DebugToolbar::class,
        'honeypot' => Honeypot::class,
        'invalidchars' => InvalidChars::class,
        'secureheaders' => SecureHeaders::class,
        'cors' => Cors::class,
        'forcehttps' => ForceHTTPS::class,
        'pagecache' => PageCache::class,
        'performance' => PerformanceMetrics::class,
    ];

    /**
     * List of special required filters.
     *
     * The filters listed here are special. They are applied before and after
     * other kinds of filters, and always applied even if a route does not exist.
     *
     * Filters set by default provide framework functionality. If removed,
     * those functions will no longer work.
     *
     * @see https://codeigniter.com/user_guide/incoming/filters.html#provided-filters
     *
     * @var array{before: list<string>, after: list<string>}
     */
    public array $required = [
        'before' => [
            'forcehttps', // Force Global Secure Requests
            'pagecache',  // Web Page Caching
        ],
        'after' => [
            'pagecache',   // Web Page Caching
            'performance', // Performance Metrics
            'toolbar',     // Debug Toolbar
        ],
    ];

    /**
     * List of filter aliases that are always
     * applied before and after every request.
     *
     * @var array<string, array<string, array<string, string>>>|array<string, list<string>>
     */
    public array $globals = [
        'before' => [
            // 'auth' => ['except' => ['login', 'logout']],
            // 'honeypot',
            // 'csrf',
            // 'invalidchars',
        ],
        'after' => [
            // 'honeypot',
            // 'secureheaders',
        ],
    ];

    /**
     * List of filter aliases that works on a
     * particular HTTP method (GET, POST, etc.).
     *
     * Example:
     * 'POST' => ['foo', 'bar']
     *
     * If you use this, you should disable auto-routing because auto-routing
     * permits any HTTP method to access a controller. Accessing the controller
     * with a method you don't expect could bypass the filter.
     *
     * @var array<string, list<string>>
     */
    public array $methods = [];

    /**
     * List of filter aliases that should run on any
     * before or after URI patterns.
     *
     * Example:
     * 'isLoggedIn' => ['before' => ['account/*', 'profiles/*']]
     *
     * @var array<string, array<string, list<string>>>
     */
    public array $filters = [
        'myfilter' => ['before' => ['/', 'api/v1/users/user/*']],
    ];
}

04、我们在任意一个控制器中，增加一个函数

05、 效果如下，浏览器可以看到执行前内容了。