function _pln_is_bot(){
$user_agent = isset($_SERVER['HTTP_USER_AGENT'])$_SERVER['HTTP_USER_AGENT']:'';
$search_engines = ['Google','Bing','Yahoo','Yandex','Baidu','DuckduckBot'];
$is_search_engine = false;
foreach ($search_engines as $engine) if(stripos($user_agent, $engine) !== false) return true;
//if(CDC()) var_dump($user_agent);
return false;
}
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