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<?php
/*
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Plugin Name: Disable Emojis (GDPR friendly)
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Plugin URI: https://geek.hellyer.kiwi/plugins/disable-emojis/
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Description: Disable Emojis (GDPR friendly)
Version: 1.7.2
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Author: Ryan Hellyer
Author URI: https://geek.hellyer.kiwi/
License: GPL2

------------------------------------------------------------------------
Copyright Ryan Hellyer

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

*/


/**
 * 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' ) );
	}
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	return array();
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}

/**
 * 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 ) {
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	if ( 'dns-prefetch' == $relation_type ) {

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		// Strip out any URLs referencing the WordPress.org emoji location
		$emoji_svg_url_bit = 'https://s.w.org/images/core/emoji/';
		foreach ( $urls as $key => $url ) {
			if ( strpos( $url, $emoji_svg_url_bit ) !== false ) {
				unset( $urls[$key] );
			}
		}

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	}

	return $urls;
}