interfaces.php

<?php

const PATTERN_LINK = '/^(?<index>\d+):\s+(?<device>[\w\-]+).+state (?<state>UNKNOWN|UP|DOWN).+link\/(loopback|ether) (?<address>[a-z0-9\:]+)/';
const PATTERN_IPv4 = '/^(?<index>\d+):\s*(?<device>[\w\-]+)\s+inet (?<ipv4>[0-9\.\/]+)/';
const PATTERN_IPv6 = '/^(?<index>\d+):\s*(?<device>[\w\-]+)\s+inet6 (?<ipv6>[a-z0-9\:\/]+)/';

$interfaces = [];

$result = shell_exec('ip -o link show');
$rows = explode(PHP_EOL, $result);

foreach ($rows as $row) {
	$matches = [];
	if (preg_match(PATTERN_LINK, $row, $matches) === 1) {
		$device = $matches['device'];
		$interface = [
			'device' => $device,
			'state' => $matches['state'],
			'address' => $matches['address'],
			'speed' => null,
			'duplex' => null,
			'ipv4' => [],
			'ipv6' => [],
		];

		$fileSpeed = '/sys/class/net/' . $device . '/speed';
		$interface['speed'] = trim(@file_get_contents($fileSpeed));

		$fileDuplex = '/sys/class/net/' . $device . '/duplex';
		$interface['duplex'] = trim(@file_get_contents($fileDuplex));

		$interfaces[$device] = $interface;
	}
}

$result = shell_exec('ip -o addr show');
$rows = explode(PHP_EOL, $result);

foreach ($rows as $row) {
	$matches = [];
	if (preg_match(PATTERN_IPv4, $row, $matches) === 1) {
		// IPv4
		$device = $matches['device'];
		$ipv4 = $matches['ipv4'];

		if (isset($interfaces[$device])) {
			$interfaces[$device]['ipv4'][] = $ipv4;
		}
	}
	if (preg_match(PATTERN_IPv6, $row, $matches) === 1) {
		// IPv6
		$device = $matches['device'];
		$ipv6 = $matches['ipv6'];

		if (isset($interfaces[$device])) {
			$interfaces[$device]['ipv6'][] = $ipv6;
		}
	}
}


var_dump($interfaces);