php测试网络连接

<?php
$url = 'https://example.com';
$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);

if ($response === false) {
    echo 'Error: ' . curl_error($ch);
} else {
    echo 'Response: ' . $response;
}

curl_close($ch);
?>

<?php
$url = 'https://example.com';
$response = file_get_contents($url);

if ($response === false) {
    echo 'Error: Failed to fetch the URL';
} else {
    echo 'Response: ' . $response;
}
?>

<?php
$host = 'example.com';
$port = 80;
$timeout = 10;

$socket = fsockopen($host, $port, $errno, $errstr, $timeout);

if (!$socket) {
    echo "Error: $errstr ($errno)";
} else {
    echo "Connected successfully";
    fclose($socket);
}
?>

<?php
$host = 'example.com';
if (gethostbyname($host) === false) {
    echo 'DNS resolution failed for ' . $host;
} else {
    echo 'DNS resolution succeeded for ' . $host;
}
?>

<?php
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://example.com');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10); // 连接超时时间
curl_setopt($ch, CURLOPT_TIMEOUT, 30); // 传输超时时间
$response = curl_exec($ch);

if ($response === false) {
    echo 'Error: ' . curl_error($ch);
} else {
    echo 'Response: ' . $response;
}

curl_close($ch);
?>