<?phpfunction Networkcheck($url){  $agent = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0";  //curl_init-初始化一個curl會話  $ch=curl_init();  //curl_setopt — 為一個curl設置會話參數  curl_setopt($ch, CURLOPT_URL,$url );  curl_setopt($ch, CURLOPT_USERAGENT, $agent);  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  curl_setopt($ch,CURLOPT_VERBOSE,false);  curl_setopt($ch, CURLOPT_TIMEOUT, 5);  curl_setopt($ch,CURLOPT_SSL_VERIFYPEER, FALSE);  curl_setopt($ch,CURLOPT_SSLVERSION,3);  curl_setopt($ch,CURLOPT_SSL_VERIFYHOST, FALSE);  //curl_exec —執行一個curl會話  $page=curl_exec($ch);  //curl_getinfo — 獲取一個curl連接資源句柄的信息  $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);  //curl_close()函數的作用是關閉一個curl會話，唯一的參數是curl_init()函數返回的句柄。  curl_close($ch);  if($httpcode>=200 && $httpcode<300)    return true;  else    return false;}//函數參數為要檢查的網站的網址路徑if(Networkcheck("https://www.baidu.com"))  echo "Website OK";else  echo "Website DOWN";?>