add_action('admin_init', 'php_search_ban_key');
function php_search_ban_key() {
add_settings_field('php_search_key', '搜索关键词屏蔽', 'php_search_key_callback_function', 'reading');
register_setting('reading','php_search_key');
}

function php_search_key_callback_function() {
echo '<textarea name="php_search_key" rows="10" cols="50" id="php_search_key" class="large-text code">' .

get_option('php_search_key') . '</textarea>';
}
add_action('template_redirect', 'php_search_ban');
function php_search_ban(){
if (is_search()) {
global $wp_query;
$php_search_key = get_option('php_search_key');
if($php_search_key){
$php_search_key = str_replace("\r\n", "|", $php_search_key);
$BanKey = explode('|', $php_search_key);
$S_Key = $wp_query->query_vars;
foreach($BanKey as $Key){
if( stristr($S_Key['s'],$Key) != false ){
wp_die('请不要搜索敏感关键字');
}
}
}
}
}

WordPress 怎么屏蔽恶意搜索关键词#WordPress主题