在所有内部搜索uninstall.php 我在硬盘中找到了两个具有此功能的文件is_multisite(): User Role Editor 和Add Code to Head.

两者都使用$wpdb 环简化：

<?php
/**
 * Plugin Uninstall Procedure
 */

// Make sure that we are uninstalling
if ( !defined( \'WP_UNINSTALL_PLUGIN\' ) ) 
    exit();

// Leave no trail
$option_name = \'plugin_option_name\';

if ( !is_multisite() ) 
{
    delete_option( $option_name );
} 
else 
{
    global $wpdb;
    $blog_ids = $wpdb->get_col( "SELECT blog_id FROM $wpdb->blogs" );
    $original_blog_id = get_current_blog_id();

    foreach ( $blog_ids as $blog_id ) 
    {
        switch_to_blog( $blog_id );
        delete_option( $option_name );     

        // OR
        // delete_site_option( $option_name );  
    }

    switch_to_blog( $original_blog_id );
}