filters.md

Filters

• Using Filters in Service Providers
• Using Filters with the App Helper Function

Using Filters in Service Providers

Easily hook into WordPress' filters.

Instead of creating a function then calling that function inside of WordPress' add_filter function, simply access it through the service container and use a callback.

Let's say we've created a service provider specifically for theme functions. We'll filter the_content output by using the the_content filter.

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class ThemeFunctionsServiceProvider extends ServiceProvider
{
    public function register()
    {
        $this->app['filters']->listen('the_content', function($content) {
            
            if (is_single()) {
                $content = sprintf(
                    '<img class="banner" src="%s/images/banner.png" alt="Banner Image" />%s',
                    larapress_assets(),
                    $content
                );
            }
            
            return $content;
        });
    }
}

Note: Many filters (like the_content) are unnecessary with LaraPress because pages use blade! We tend to only use filters with plugins and to modify the admin interface when needed.

Using Filters with the App Helper Function

Of course you can also hook into WordPress filters using the app helper function.

app('filters')->listen('the_content', function($content) {
    //Code goes here
});