用fsockopen来实现的，很简单，不过就是有点慢，！
#[测试fsockopen功能]
error_reporting(0);
$url=$row_runlist['ip']; //从数据库中读取IP
$pp=$row_runlist['webport']; //从数据库中读取端口
$test = fsockopen( "$url","$pp",$errno,$errstr,2);
if($test)
{
echo "
";
}
else
{
echo "
";
}
?>
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