Simple SMTP auth test

smtp-test.php

<?php declare(strict_types=1);

	function connect(string $user, string $pass)
	{
		$host = '192.168.0.147';
		$errno = $errstr = null;
		if (!($socket = fsockopen($host, 587, $errno, $errstr, 15))) {
			die("Failed to connect to $host");
		}

		server_parse($socket, '220');

		fwrite($socket, "EHLO randohost\r\n");
		server_parse($socket, '250');

		fwrite($socket, 'AUTH LOGIN' . "\r\n");
		server_parse($socket, '334');

		fwrite($socket, base64_encode($user) . "\r\n");
		server_parse($socket, '334');

		fwrite($socket, base64_encode($pass) . "\r\n");
		if (server_parse($socket, '235')) {
			echo "Found a match! $user:$pass\n";
		}

		fwrite($socket, 'QUIT' . "\r\n");
		fclose($socket);

		return true;
	}

	//Functin to Processes Server Response Codes
	function server_parse($socket, $expected)
	{
		$server_response = '';
		do {
			if (!($server_response = fgets($socket, 256))) {
				die('Error while fetching server response codes. Expected: ' . $expected);
			}
		} while ($server_response[3] !== ' ');

		return strpos($server_response, $expected) === 0;
	}

	$usage = getrusage();
	connect("foo", "bar");
	$finusage = getrusage();
	foreach ($usage as $k => $v) {
		echo "$k: ", ($finusage[$k] - $v), "\n";
	}