WordPress 4.2+ Emoji 表情优化

发表于 2015年10月14日
日志
更新于 2015年10月19日 11:03:07 上午

如果你更新到 WordPress 的 4.2 版本，查看网页源代码你会发现 WordPress 会自动在加载一段用于支持 emjo 表情的脚本（JS+CSS）。对于大部分人来说，这个是十分鸡肋的功能，再加上 GFW 的强大力量，反而影响加载速度。

我们有两种解决方法：启用或禁用。

原因分析，脚本就是类似下面的代码：

<script type="text/javascript">
 window._wpemojiSettings = {"baseUrl":"http:\/\/s.w.org\/images\/core\/emoji\/72x72\/","ext":".png","source":{"concatemoji":"http:\/\/devework.com\/wp-includes\/js\/wp-emoji-release.min.js?ver=4.2"}};
 !function(a,b,c){function d(a){var c=b.createElement("canvas"),d=c.getContext&&c.getContext("2d");return d&&d.fillText?(d.textBaseline="top",d.font="600 32px Arial","flag"===a?(d.fillText(String.fromCharCode(55356,56812,55356,56807),0,0),c.toDataURL().length>3e3):(d.fillText(String.fromCharCode(55357,56835),0,0),0!==d.getImageData(16,16,1,1).data[0])):!1}function e(a){var c=b.createElement("script");c.src=a,c.type="text/javascript",b.getElementsByTagName("head")[0].appendChild(c)}var f;c.supports={simple:d("simple"),flag:d("flag")},c.supports.simple&&c.supports.flag||(f=c.source||{},f.concatemoji?e(f.concatemoji):f.wpemoji&&f.twemoji&&(e(f.twemoji),e(f.wpemoji)))}(window,document,window._wpemojiSettings);
 </script>
 <style type="text/css">
 img.wp-smiley,
 img.emoji {
 display: inline !important;
 border: none !important;
 box-shadow: none !important;
 height: 1em !important;
 width: 1em !important;
 margin: 0 .07em !important;
 vertical-align: -0.1em !important;
 background: none !important;
 padding: 0 !important;
 }
 </style>

window._wpemojiSettings = {"baseUrl":"http:\/\/s.w.org\/images\/core\/emoji\/72x72\/","ext":".png","source":{"concatemoji":"http:\/\/devework.com\/wp-includes\/js\/wp-emoji-release.min.js?ver=4.2"}};

</script>

img.wp-smiley,

img.emoji {

display: inline !important;

border: none !important;

box-shadow: none !important;

height: 1em !important;

width: 1em !important;

margin: 0 .07em !important;

vertical-align: -0.1em !important;

background: none !important;

padding: 0 !important;

}

</style>

因为WordPress 更新 4.2 的一个新增功能就是支持 emjo 表情，但看部分加载源居然是 wp.org 的 js 文件。对于大部分人来说，这个是十分鸡肋的功能。
Twitter 官方提供了来自 MaxCDN 的 CDN 服务：http://twemoji.maxcdn.com/
要将默认 CDN 地址修改为 MaxCDN，只需将以下代码粘贴到主题 functions.php 的最后：

// 替换 WordPress 默认 Emoji 资源地址
function c7sky_change_wp_emoji_baseurl($url){
	return set_url_scheme('//twemoji.maxcdn.com/72x72/');
}
add_filter('emoji_url', 'c7sky_change_wp_emoji_baseurl');

// 替换 WordPress 默认 Emoji 资源地址

function c7sky_change_wp_emoji_baseurl($url){

return set_url_scheme('//twemoji.maxcdn.com/72x72/');

}

add_filter('emoji_url', 'c7sky_change_wp_emoji_baseurl');

禁用：移除 WordPress 4.2 中前台自动加载的 emoji 脚本

既然功能鸡肋，不如直接移除掉来得更加快捷。代码提取自 Disable Emojis 插件，可以放在主题目录下的 functions.php 文件中：

/**
 * 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' );
/**
 * Filter function used to remove the tinymce emoji plugin.
 */
 function disable_emojis_tinymce( $plugins ) {
 if ( is_array( $plugins ) ) {
 return array_diff( $plugins, array( 'wpemoji' ) );
 } else {
 return array();
 }
 }

/**

* 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' );

/**

* Filter function used to remove the tinymce emoji plugin.

function disable_emojis_tinymce( $plugins ) {

if ( is_array( $plugins ) ) {

return array_diff( $plugins, array( 'wpemoji' ) );

} else {

return array();

}

启用：转存至本地调用 Emoji 表情

WordPress 官方将此功能会写入正式版一定有其理由。但我们知道 WP 的 CDN 早就被*掉，唯一方法就是转存到本地，使 WP 识别本地 Emoji 表情。

Twitter Emoji 表情包下载，下载后直接解压至主题目录，文件夹名不变。将以下代码放在主题目录下的 functions.php 文件中：

//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 并禁用 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');
 //输出表情
 function fa_get_wpsmiliestrans(){
 global $wpsmiliestrans;
 $wpsmilies = array_unique($wpsmiliestrans);
 foreach($wpsmilies as $alt => $src_path){
 $emoji = str_replace(array('&#x', ';'), '', wp_encode_emoji($src_path));
 $output .= '<a class="add-smily" data-smilies="'.$alt.'"><img class="wp-smiley" src="'.get_bloginfo('template_directory').'/72x72/'. $emoji .'png" /></a>';
 }
 return $output;
 }

//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 并禁用 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');

//输出表情

function fa_get_wpsmiliestrans(){

global $wpsmiliestrans;

$wpsmilies = array_unique($wpsmiliestrans);

foreach($wpsmilies as $alt => $src_path){

$emoji = str_replace(array('&#x', ';'), '', wp_encode_emoji($src_path));

$output .= '<a class="add-smily" data-smilies="'.$alt.'"><img class="wp-smiley" src="'.get_bloginfo('template_directory').'/72x72/'. $emoji .'png" /></a>';

}

return $output;

}