Detailed example of PHP+Ajax detecting whether the network is normal-PHP Tutorial-php.cn

Detailed example of PHP+Ajax detecting whether the network is normal

黄舟

Release： 2023-03-03 14:24:02

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The example in this article describes the method of PHP+Ajax to automatically detect whether the Internet is connected in real time. Share it with everyone for your reference. The specific implementation method is as follows:

HTML part code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>PHP+Ajax实时自动检测是否联网</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript">
<!--
var xmlHttp;
function createXMLHttpRequest(){
 if(window.ActiveXObject){
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 else if(window.XMLHttpRequest){
  xmlHttp = new XMLHttpRequest();
 }
}
function start(){
 createXMLHttpRequest();
 var url="getNetLink";
 xmlHttp.open("GET",url,true);
 xmlHttp.onreadystatechange = callback;
 xmlHttp.send(null);
}
function callback(){
 if(xmlHttp.readyState == 4){
  if(xmlHttp.status == 200){
   document.getElementById("shownetlink").innerHTML = xmlHttp.responseText;
   setTimeout("start()",8000);
  }
 }
}
// -->
</script>
</head>
<body onload="start();">
<h1>PHP+Ajax实时自动检测是否联网</h1>
<p>当前网络状态：<span id="shownetlink"></span></p>
</body>
</html>

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php part code:

public function getNetLink(){ 
 header("cache-control:no-cache,must-revalidate"); 
 header("Content-Type:text/html;charset=utf-8"); 
 $file=fopen("http://www.baidu.com/", "r"); 
 if (!$file){ 
  $shownetlink = "<font color=\"red\">网络连接失败</font>"; 
 }else{ 
  $shownetlink = "<font color=\"#06C\">网络连接正常</font>"; 
 } 
 echo $shownetlink; 
}

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