PHP判断是否连接上网络的小例子

//检测网络是否连接
function varify_url($url){
$check = @fopen($url,"r");
if($check){
 $status = true;
}else{
 $status = false;
}
return $status;
} //by bbs.it-home.org

调用示例：

$url = "http://bbs.it-home.org";
if(varify_url($url)){
 echo "Congratulation ! Your URL $url  : is valid 
";
}else{
 echo "Error ! 你提供的URL : $url is invalid 
";
}