php 检测网络

<?php
function checkNetworkConnection($host, $port = 80, $timeout = 10) {
    $socket = @fsockopen($host, $port, $errno, $errstr, $timeout);
    if (!$socket) {
        return false;
    } else {
        fclose($socket);
        return true;
    }
}

$host = 'www.example.com';
if (checkNetworkConnection($host)) {
    echo "网络连接正常";
} else {
    echo "网络连接失败";
}
?>

<?php
function checkUrlResponse($url) {
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_NOBODY, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    return $httpCode;
}

$url = 'http://www.example.com';
$responseCode = checkUrlResponse($url);
if ($responseCode >= 200 && $responseCode < 300) {
    echo "URL响应正常";
} else {
    echo "URL响应异常，状态码: " . $responseCode;
}
?>