WordPressで絵文字のスタイルやスクリプトの読み込みを無効化する方法

add_action( 'init', function(){

  // インラインスクリプトの読み込みを無効化
  remove_action( 'wp_head', 'print_emoji_detection_script', 7 );

  // インラインスタイルの読み込みを無効化
  remove_action( 'wp_print_styles', 'print_emoji_styles' );

  // インラインスタイルの読み込みを無効化（6.4以降対策）
  if ( function_exists( 'wp_enqueue_emoji_styles' ) ) {
    remove_action( 'wp_enqueue_scripts', 'wp_enqueue_emoji_styles' );
  }

}
);

// インラインスクリプトの読み込みを無効化
remove_action( 'wp_head', 'print_emoji_detection_script', 7 );

<!-- 例）フロントのheadタグ内 -->
<script type="text/javascript">
/* <![CDATA[ */
window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/14.0.0\/svg\/","svgExt":".svg","source":{"concatemoji":"http:\/\/サイトドメイン\/wp-includes\/js\/wp-emoji-release.min.js?ver=6.4.2"}};
/*! This file is auto-generated */
!function(i,n){var o,s,e;function c(e){try{var t={supportTests:e,timestamp:(new Date).valueOf()};sessionStorage.setItem(o,JSON.stringify(t))}catch(e){}}function p(e,t,n){e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(t,0,0);var t=new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data),r=(e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(n,0,0),new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data));return t.every(function(e,t){return e===r[t]})}function u(e,t,n){switch(t){case"flag":return n(e,"\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f","\ud83c\udff3\ufe0f\u200b\u26a7\ufe0f")?!1:!n(e,"\ud83c\uddfa\ud83c\uddf3","\ud83c\uddfa\u200b\ud83c\uddf3")&&!n(e,"\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f","\ud83c\udff4\u200b\udb40\udc67\u200b\udb40\udc62\u200b\udb40\udc65\u200b\udb40\udc6e\u200b\udb40\udc67\u200b\udb40\udc7f");case"emoji":return!n(e,"\ud83e\udef1\ud83c\udffb\u200d\ud83e\udef2\ud83c\udfff","\ud83e\udef1\ud83c\udffb\u200b\ud83e\udef2\ud83c\udfff")}return!1}function f(e,t,n){var r="undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?new OffscreenCanvas(300,150):i.createElement("canvas"),a=r.getContext("2d",{willReadFrequently:!0}),o=(a.textBaseline="top",a.font="600 32px Arial",{});return e.forEach(function(e){o[e]=t(a,e,n)}),o}function t(e){var t=i.createElement("script");t.src=e,t.defer=!0,i.head.appendChild(t)}"undefined"!=typeof Promise&&(o="wpEmojiSettingsSupports",s=["flag","emoji"],n.supports={everything:!0,everythingExceptFlag:!0},e=new Promise(function(e){i.addEventListener("DOMContentLoaded",e,{once:!0})}),new Promise(function(t){var n=function(){try{var e=JSON.parse(sessionStorage.getItem(o));if("object"==typeof e&&"number"==typeof e.timestamp&&(new Date).valueOf()<e.timestamp+604800&&"object"==typeof e.supportTests)return e.supportTests}catch(e){}return null}();if(!n){if("undefined"!=typeof Worker&&"undefined"!=typeof OffscreenCanvas&&"undefined"!=typeof URL&&URL.createObjectURL&&"undefined"!=typeof Blob)try{var e="postMessage("+f.toString()+"("+[JSON.stringify(s),u.toString(),p.toString()].join(",")+"));",r=new Blob([e],{type:"text/javascript"}),a=new Worker(URL.createObjectURL(r),{name:"wpTestEmojiSupports"});return void(a.onmessage=function(e){c(n=e.data),a.terminate(),t(n)})}catch(e){}c(n=f(s,u,p))}t(n)}).then(function(e){for(var t in e)n.supports[t]=e[t],n.supports.everything=n.supports.everything&&n.supports[t],"flag"!==t&&(n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&n.supports[t]);n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&!n.supports.flag,n.DOMReady=!1,n.readyCallback=function(){n.DOMReady=!0}}).then(function(){return e}).then(function(){var e;n.supports.everything||(n.readyCallback(),(e=n.source||{}).concatemoji?t(e.concatemoji):e.wpemoji&&e.twemoji&&(t(e.twemoji),t(e.wpemoji)))}))}((window,document),window._wpemojiSettings);
/* ]]> */
</script>

// インラインスタイルの読み込みを無効化
remove_action( 'wp_print_styles', 'print_emoji_styles' )

<style id='wp-emoji-styles-inline-css' 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 0.07em !important;
    vertical-align: -0.1em !important;
    background: none !important;
    padding: 0 !important;
  }
</style>

// インラインスタイルの読み込みを無効化（6.4以降対策）
if ( function_exists( 'wp_enqueue_emoji_styles' ) ) {
  remove_action( 'wp_enqueue_scripts', 'wp_enqueue_emoji_styles' );
}

// 管理画面のスタイルとスクリプトの読み込みを無効化
add_action( 'admin_init', function(){
  
  // インラインスクリプトの読み込みを無効化
  remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );

  // インラインスタイルの読み込みを無効化
  remove_action( 'admin_print_styles', 'print_emoji_styles' );

  // WordPress 6.4以降向け対策
  if ( function_exists( 'wp_enqueue_emoji_styles' ) ) {
    remove_action( 'admin_enqueue_scripts', 'wp_enqueue_emoji_styles' );
  }

}
);

// RSSの絵文字を画像に変換にする処理を無効化
remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );

// メールの中の絵文字を画像に変換する処理を無効化
remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );