您应该记住的一件事是该函数，它将连接到manage_users_custom_column 行动must have 3 parameters, 第一个（即。$val) 应为返回值：

// Add custom column using \'manage_users_columns\' filter
if(!function_exists(\'bm_utm_column\')){
function bm_utm_column($columns) {
    return array_merge( $columns, 
        array(\'utm_source\' => __(\'UTM source\'),
            \'utm_medium\' => __(\'UTM medium\')
            ) 
        );
    }
}

// Add the content from usermeta\'s table by using \'manage_users_custom_column\' hook
if(!function_exists(\'bm_utm_column_value\')){
   function bm_utm_column_value($val, $column_name, $user_id) {
    if ( \'utm_source\' == $column_name ) {
        //Custom value
        $val = get_user_meta($user_id, \'utm_source\', true);
    }
    if ( \'utm_medium\' == $column_name ) {
        //Custom value
        $val = get_user_meta($user_id, \'utm_medium\', true);
    }
    return $val;
   }
}
// Hook into filter
add_filter( \'manage_users_columns\', \'bm_utm_column\' );
add_action( \'manage_users_custom_column\', \'bm_utm_column_value\', 10, 3 );

用户列表列按筛选manage_users_columns. 看看这个简单的示例，了解如何连接到此过滤器：

// We add another column using \'manage_users_columns\' filter
function my_payment_column($columns) {
    return array_merge( $columns, 
              array(\'payment\' => __(\'Payment\')) 
            );
}
// Now we add some content to each row by using \'manage_users_custom_column\' hook
function my_payment_column_value($column_name, $user_id) {
        if ( \'payment\' == $column_name ) {
            // Place to add checkbox, text field, etc.

            // If the user has paid, show it. Else, show N/A.
            if ( isset($paid) && $paid ) {
                echo __(\'Paid\',\'text-domain\');
            } else {
                echo __(\'N/A\',\'text-domain\');
            }
        }
}
// Hook into filter
add_filter( \'manage_users_columns\', \'my_payment_column\' );
add_action( \'manage_users_custom_column\', \'my_payment_column_value\', 10, 2 );

你可以用这个

function modify_user_table( $column ) {
   $column[\'comments\'] = \'Comments\';
   return $column;
}
add_filter( \'manage_users_columns\', \'modify_user_table\' );

function modify_user_table_row( $val, $column_name, $user_id ) { 
   global $wpdb;
   if ($column_name == \'comments\') {
       $comment_count = $wpdb->get_var( wpdb->prepare( "SELECT COUNT(*) S total FROM $wpdb->comments WHERE comment_approved = 1 AND user_id = %s", $user_id ) );
       return $comment_count; 
   }
   return $val;
}
add_filter( \'manage_users_custom_column\', \'modify_user_table_row\', 10, 3 );