PHP功能失败时如何将域名解析为IP地址？

Question

I need to resolve any given domain in PHP to its corresponding IP address.gethostbyname appears to perform a reverse DNS (rDNS) and isn't useful for obtaining the IP address of a domestic connection (that doesn't have direct rDNS).

I have the following, which of course doesn't work:

<?php
    if (ISSET($_POST["domain"])) {
        require_once("/protected/db.php");
        echo gethostbyname($_POST["domain"]);
    }
    echo "Error";
?>

Using dns_get_record returns Array ( ) and doesn't appear to work as PHP prints Array ( ) when I try the below code from this answer:

$result = dns_get_record($_POST["domain"],DNS_ALL);
print_r($result);

How can I do this?

Answer 1

You probably want to use dns_get_record()

I would strongly advise against cybermonkey's solution, as shell_exec() (a) is platform-dependent, and (b) can have major security issues.