File head.php

 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

<?php

namespace SIW;

use SIW\Properties;
use SIW\HTML;

/**
 * Class om head aan te passen
 *
 * - Icons voor browsers
 * - Structured data voor organisatie
 * - Optimalisatie
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 */
class Head {

    /**
     * Init
     */
    public static function init() {
        $self = new self();
        add_action( 'wp_head', [ $self, 'add_favicons' ] );
        add_filter( 'wp_resource_hints', [ $self, 'add_resource_hints' ], 10 , 2 );

        /* Optimalisatie HEAD */
        add_filter( 'the_generator', '__return_false' );
        remove_action( 'wp_head', 'wp_generator' );
        remove_action( 'wp_head', 'wlwmanifest_link' );
        remove_action( 'wp_head', 'wp_shortlink_wp_head', 10 );
        remove_action( 'wp_head', 'rest_output_link_wp_head', 10 );
        remove_action( 'wp_head', 'rsd_link' );
        remove_action( 'wp_head', 'feed_links', 2 );
        remove_action( 'wp_head', 'feed_links_extra', 3 );
        remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 );
        remove_action( 'wp_print_styles', 'print_emoji_styles' );
        remove_action( 'template_redirect', 'rest_output_link_header', 11 ) ;
    }

    /**
     * Voegt iconen voor diverse browsers toe
     */
    public function add_favicons() {

        $favicons = siw_get_data( 'favicons' );

        ?>
        <!-- Start favicons -->
        <?php
            foreach ( $favicons as $favicon ) {
                HTML::render_tag( $favicon['tag'], $favicon['attributes'] );
            }
        ?>
        <!-- Einde favicons -->
        <?php
    }

    /**
     * Voegt resource hints (dns-prefetch en preconnect) toe
     *
     * @param array $urls
     * @param string $relation_type
     * @return array
     * 
     * @todo is dns-prefetch wel nodig?
     */
    public function add_resource_hints( array $urls, string $relation_type ) {
        /**
         * URL's die gepreconnect en geprefetcht moeten worden
         * 
         * @param array $urls
         */
        $preconnect_urls = apply_filters( 'siw_preconnect_urls', [] );

        if ( 'preconnect' === $relation_type || 'dns-prefetch' === $relation_type ) {
            foreach ( $preconnect_urls as $preconnect_url ) {
                $urls[] = $preconnect_url;
            }
        }
        return $urls;
    }

}

Namespaces

Classes

Functions