WordPress 4.2+ 使用 Twemoji 替换/禁用 WP 默认 Emoji 表情

//首先补全wp的表情库
function smilies_reset() {
	global $wpsmiliestrans, $wp_smiliessearch;

	// don't bother setting up smilies if they are disabled
	if (!get_option('use_smilies')) {
		return;
	}

	$wpsmiliestrans_fixed = array(
		':mrgreen:' => "\xf0\x9f\x98\xa2",
		':smile:' => "\xf0\x9f\x98\xa3",
		':roll:' => "\xf0\x9f\x98\xa4",
		':sad:' => "\xf0\x9f\x98\xa6",
		':arrow:' => "\xf0\x9f\x98\x83",
		':-(' => "\xf0\x9f\x98\x82",
		':-)' => "\xf0\x9f\x98\x81",
		':(' => "\xf0\x9f\x98\xa7",
		':)' => "\xf0\x9f\x98\xa8",
		':?:' => "\xf0\x9f\x98\x84",
		':!:' => "\xf0\x9f\x98\x85",
	);
	$wpsmiliestrans = array_merge($wpsmiliestrans, $wpsmiliestrans_fixed);
}

//替换cdn路径
function static_emoji_url() {

	return get_bloginfo('template_directory').'/72x72/';

}
//让文章内容和评论支持emoji并起初emoji加载的乱七八糟的脚本
function reset_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');
	add_filter('the_content', 'wp_staticize_emoji');
	add_filter('comment_text', 'wp_staticize_emoji',50); //在转换为表情后再转为静态图片
        smilies_reset();
        add_filter('emoji_url', 'static_emoji_url');
}
add_action('init', 'reset_emojis');

/**
* 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_action( 'init', 'disable_emojis' );
add_filter('emoji_svg_url', '__return_false');
/**
 * Filter function used to remove the tinymce emoji plugin.
 * 
 * @param    array  $plugins  
 * @return   array  Difference betwen the two arrays
 */
function disable_emojis_tinymce( $plugins ) {
	return array_diff( $plugins, array( 'wpemoji' ) );
}
function smilies_reset() {
    global $wpsmiliestrans;
    // don't bother setting up smilies if they are disabled
    if ( !get_option( 'use_smilies' ) )
        return;

    $wpsmiliestrans = array(
    ':mrgreen:' => 'icon_mrgreen.gif',
    ':neutral:' => 'icon_neutral.gif',
    ':twisted:' => 'icon_twisted.gif',
      ':arrow:' => 'icon_arrow.gif',
      ':shock:' => 'icon_eek.gif',
      ':smile:' => 'icon_smile.gif',
        ':???:' => 'icon_confused.gif',
       ':cool:' => 'icon_cool.gif',
       ':evil:' => 'icon_evil.gif',
       ':grin:' => 'icon_biggrin.gif',
       ':idea:' => 'icon_idea.gif',
       ':oops:' => 'icon_redface.gif',
       ':razz:' => 'icon_razz.gif',
       ':roll:' => 'icon_rolleyes.gif',
       ':wink:' => 'icon_wink.gif',
        ':cry:' => 'icon_cry.gif',
        ':eek:' => 'icon_surprised.gif',
        ':lol:' => 'icon_lol.gif',
        ':mad:' => 'icon_mad.gif',
        ':sad:' => 'icon_sad.gif',
          '8-)' => 'icon_cool.gif',
          '8-O' => 'icon_eek.gif',
          ':-(' => 'icon_sad.gif',
          ':-)' => 'icon_smile.gif',
          ':-?' => 'icon_confused.gif',
          ':-D' => 'icon_biggrin.gif',
          ':-P' => 'icon_razz.gif',
          ':-o' => 'icon_surprised.gif',
          ':-x' => 'icon_mad.gif',
          ':-|' => 'icon_neutral.gif',
          ';-)' => 'icon_wink.gif',
    // This one transformation breaks regular text with frequency.
    //     '8)' => 'icon_cool.gif',
           '8O' => 'icon_eek.gif',
           ':(' => 'icon_sad.gif',
           ':)' => 'icon_smile.gif',
           ':?' => 'icon_confused.gif',
           ':D' => 'icon_biggrin.gif',
           ':P' => 'icon_razz.gif',
           ':o' => 'icon_surprised.gif',
           ':x' => 'icon_mad.gif',
           ':|' => 'icon_neutral.gif',
           ';)' => 'icon_wink.gif',
          ':!:' => 'icon_exclaim.gif',
          ':?:' => 'icon_question.gif',
    );
}
smilies_reset();

add_filter( 'the_content', 'reset_smilies_style', 99 );
add_filter( 'the_excerpt', 'reset_smilies_style', 99 );
add_filter( 'comment_text', 'reset_smilies_style', 99 );

/**
 * Reset Smilies Style
 */
function reset_smilies_style( $content ) {
	return str_replace( 'class="wp-smiley" style="height: 1em; max-height: 1em;"', 'class="wp-smiley"', $content );
}