好消息，函数现在已经存在。

File: /wp-includes/load.php
1037: /**
1038:  * Determines whether the current request is a WordPress Ajax request.
1039:  *
1040:  * @since 4.7.0
1041:  *
1042:  * @return bool True if it\'s a WordPress Ajax request, false otherwise.
1043:  */
1044: function wp_doing_ajax() {
1045:   /**
1046:    * Filters whether the current request is a WordPress Ajax request.
1047:    *
1048:    * @since 4.7.0
1049:    *
1050:    * @param bool $wp_doing_ajax Whether the current request is a WordPress Ajax request.
1051:    */
1052:   return apply_filters( \'wp_doing_ajax\', defined( \'DOING_AJAX\' ) && DOING_AJAX );
1053: }

File: /wp-admin/admin-ajax.php
11: /**
12:  * Executing Ajax process.
13:  *
14:  * @since 2.1.0
15:  */
16: define( \'DOING_AJAX\', true );
17: if ( ! defined( \'WP_ADMIN\' ) ) {
18:     define( \'WP_ADMIN\', true );
19: }

Fuxias解决方案返回false 也适用于从管理面板发出的ajax请求。但这些请求应该会返回true, 因为您请求的数据是为管理员视图提供的。要解决此问题，可以使用以下功能：

function saveIsAdmin() {
    //Ajax request are always identified as administrative interface page
    //so let\'s check if we are calling the data for the frontend or backend
    if (wp_doing_ajax()) {
        $adminUrl = get_admin_url();
        //If the referer is an admin url we are requesting the data for the backend
        return (substr($_SERVER[\'HTTP_REFERER\'], 0, strlen($adminUrl)) === $adminUrl);
    }

    //No ajax request just use the normal function
    return is_admin();
}

DOING_AJAX 如果你在，经常检查admin-ajax.php

if ( is_admin() && defined( \'DOING_AJAX\' ) && DOING_AJAX )
{
    // do something
}