PHP 检测网址链接是否连通

 function httpcode($url){
  $ch = curl_init();
  $timeout = 3;
  curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
  curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
  curl_setopt($ch, CURLOPT_HEADER, 1);
  curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
  curl_setopt($ch,CURLOPT_URL,$url);
  curl_exec($ch);
  $httpcode = curl_getinfo($ch,CURLINFO_HTTP_CODE);
  if ($httpcode==200){
  return "连通";
  }
  else {
  return "不通";
  }
  curl_close($ch);
}

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