php访问域名

<?php
$domain = "example.com";
if (gethostbyname($domain) !== false) {
    echo "Domain is reachable.";
} else {
    echo "Domain is not reachable.";
}
?>

<?php
$url = "http://example.com";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10); // 设置连接超时时间为10秒
curl_setopt($ch, CURLOPT_TIMEOUT, 30); // 设置总超时时间为30秒
$result = curl_exec($ch);
if ($result === false) {
    echo 'Curl error: ' . curl_error($ch);
} else {
    echo $result;
}
curl_close($ch);
?>

<?php
$url = "https://example.com";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 忽略SSL证书验证
$result = curl_exec($ch);
if ($result === false) {
    echo 'Curl error: ' . curl_error($ch);
} else {
    echo $result;
}
curl_close($ch);
?>