AddMetasHandler.php

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<?php
 
namespace Elgg\Page;
 
class AddMetasHandler {
    
    public function __invoke(\Elgg\Event $event) {
        $head_params = $event->getValue();
        
        $head_params['metas']['content-type'] = [
            'http-equiv' => 'Content-Type',
            'content' => 'text/html; charset=utf-8',
        ];
        
        $description = elgg_get_site_entity()->description;
        if (!empty($description)) {
            $head_params['metas']['description'] = [
                'name' => 'description',
                'content' => $description,
            ];
        }
        
        // https://developer.chrome.com/multidevice/android/installtohomescreen
        $head_params['metas']['viewport'] = [
            'name' => 'viewport',
            'content' => 'width=device-width, initial-scale=1.0, maximum-scale=5.0, user-scalable=1',
        ];
        
        $head_params['metas']['mobile-web-app-capable'] = [
            'name' => 'mobile-web-app-capable',
            'content' => 'yes',
        ];
        
        $head_params['metas']['apple-mobile-web-app-capable'] = [
            'name' => 'apple-mobile-web-app-capable',
            'content' => 'yes',
        ];
    
        return $head_params;
    }
}