PHP判断是否连接上网络的方法

function varify_url($url){ $check = @fopen($url,"r"); if($check){  $status = true; }else{  $status = false; }  return $status; }

$url = "http://www.baidu.com"; if(varify_url($url)){  echo "<div>Congratulation ! Your URL <a href=$url>$url</a> : is <b>valid </b></div>"; }else{  echo "<div>Error ! Your URL : <a href=$url>$url</a> is <b>invalid </b></div>"; }