Question

我想只在互联网工作时才更新mysql字段..... 要检查互联网，我的脚本是

<?php 
//function to check if the local machine has internet connection 
function checkConnection() 
{ 
    //Initiates a socket connection to www.itechroom.com at port 80
    $conn = @fsockopen("www.google.com", 80, $errno, $errstr, 30); 
    if ($conn)
    { 
        $status = "Connection is OK";  
        fclose($conn);
    }
    else
    {
        $status = "NO Connection<br/>\n";
        $status .= "$errstr ($errno)"; 
    }
    return $status; 
}

echo checkConnection();
?>

如果连接正常，我想运行此查询，否则不运行它

    <?php
/////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////
$con=mysqli_connect("localhost","root","","ex_smartcard2013");

if (mysqli_connect_errno())
  { 
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

mysqli_query($con,"UPDATE fess SET status=1 WHERE status=0 order by id desc limit 1");
mysqli_close($con);

?>

怎么做............

Answer 1

使用这样的功能。

<?php
//function to check if the local machine has internet connection 
function checkConnection() 
{ 
    //Initiates a socket connection to www.itechroom.com at port 80
    $conn = @fsockopen("www.google.com", 80, $errno, $errstr, 30); 
    if ($conn)
    { 
        $status = true;  
    }
    else
    {
        $status = false;
        //$status .= "$errstr ($errno)"; 
    }
    fclose($conn);

    return $status; 
}

if(checkConnection()) {

    $con=mysqli_connect("localhost","root","","ex_smartcard2013");

    if (mysqli_connect_errno())
    { 
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    mysqli_query($con,"UPDATE fess SET status=1 WHERE status=0 order by id desc limit 1");
    mysqli_close($con);

}
?>

Answer 2

修改Salim's answer和JTC's notation，我们得到

function checkConnection() {
    return $conn = @fsockopen("www.google.com", [80|443]);
}

if (checkConnection()) {
    $con = mysqli_connect(...);
    // the rest is yours
}

如果您希望如上所述使用自己的checkConnection()，那么只需测试适当的条件。你期望它回归什么？

$hasInternet = checkConnection();

if ($hasInternet == "...") {
    // ...
}

另外还有一个注意事项：如果您的互联网连接已启动，但您无法访问DNS服务，则@fsockopen会对您不利。出于这个原因，我总是喜欢4.2.2.4来ping某事，看看我能不能......

仅在连接互联网时才更新mysql

2 个答案: