davidpeach · September 22, 2020 20:42 · Sep 22, 2020
diff --git a/wp-disable-emojis-plugin.php b/wp-disable-emojis-plugin.php
@@ -0,0 +1,58 @@
+<?php
+/*
+Plugin Name:  Disable Emojis
+Plugin URI:   https://davidpeach.co.uk
+Description:  Stop the connection to w.org through emojis
+Version:      1.0.0
+Author:       David Peach
+Author URI:   https://davidpeach.co.uk
+License:      GNU
+*/
+
+/**
+ * Disable the emoji's
+ */
+function disable_emojis() {
+    remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
+    remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
+    remove_action( 'wp_print_styles', 'print_emoji_styles' );
+    remove_action( 'admin_print_styles', 'print_emoji_styles' );
+    remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
+    remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
+    remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
+    add_filter( 'tiny_mce_plugins', 'disable_emojis_tinymce' );
+    add_filter( 'wp_resource_hints', 'disable_emojis_remove_dns_prefetch', 10, 2 );
+}
+add_action( 'init', 'disable_emojis' );
+
+/**
+ * Filter function used to remove the tinymce emoji plugin.
+ *
+ * @param array $plugins
+ * @return array Difference betwen the two arrays
+ */
+function disable_emojis_tinymce( $plugins ) {
+    if ( is_array( $plugins ) ) {
+        return array_diff( $plugins, array( 'wpemoji' ) );
+    } else {
+        return array();
+    }
+}
+
+/**
+ * Remove emoji CDN hostname from DNS prefetching hints.
+ *
+ * @param array $urls URLs to print for resource hints.
+ * @param string $relation_type The relation type the URLs are printed for.
+ * @return array Difference betwen the two arrays.
+ */
+function disable_emojis_remove_dns_prefetch( $urls, $relation_type ) {
+    if ( 'dns-prefetch' == $relation_type ) {
+        /** This filter is documented in wp-includes/formatting.php */
+        $emoji_svg_url = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/' );
+
+        $urls = array_diff( $urls, array( $emoji_svg_url ) );
+    }
+
+    return $urls;
+}