checkdnsrr/dns_check_record works in CLI but not in mod_php on macOS

[VanessaPhippsCfa]

Description

The following code:

<?php
$result = checkdnsrr('google.com', 'A');
var_dump($result);

Resulted in this output:

bool(false)

But I expected this output instead:

bool(true)

3v4l link: https://3v4l.org/mchKq

3v4l also seems unable to get "true" out of this. However, this works fine on my machine:

/opt/homebrew/bin/php -r '$result = checkdnsrr("google.com", "A"); var_dump($result);'

My Rocky 6 production server (yes we're upgrading) also gets true for this code, even in mod_php.

I initially spotted this behavior in 7.4, but verified it's present on 8.4 as well.

PHP Version

PHP 8.4.7 (cli) (built: May  6 2025 12:31:58) (NTS)
Copyright (c) The PHP Group
Built by Homebrew
Zend Engine v4.4.7, Copyright (c) Zend Technologies
    with Zend OPcache v8.4.7, Copyright (c), by Zend Technologies

Here's the top of the mod_php phpinfo() output:

PHP Version 8.4.7

System	Darwin Vanessas-MacBook-Pro.local 24.4.0 Darwin Kernel Version 24.4.0: Fri Apr 11 18:33:47 PDT 2025; root:xnu-11417.101.15~117/RELEASE_ARM64_T6030 arm64
Build Date	May 6 2025 12:31:58
Build System	Darwin Sequoia-arm64.local 24.4.0 Darwin Kernel Version 24.4.0: Fri Apr 11 18:33:24 PDT 2025; root:xnu-11417.101.15~117/RELEASE_ARM64_VMAPPLE arm64
Build Provider	Homebrew

Operating System

macOS Sequoia 15.4.1 on ARM (Apple M3 Pro)