Check SMTP Connection in PHP

<?php
function checkSMTPConnection($email, $password, $host, $port, $secured)
{
    // Establish a TCP/IP socket connection
    $context = stream_context_create([
        'ssl' => [
            'verify_peer' => false,
            'verify_peer_name' => false,
        ],
    ]);

    $socket = stream_socket_client("tcp://$host:$port", $errno, $errstr, 10, STREAM_CLIENT_CONNECT, $context);

    if ($socket) {
        // Read the server's response
        $response = fread($socket, 8192);

        // Send EHLO/HELO command
        fwrite($socket, "EHLO example.com\r\n");
        $response = fread($socket, 8192);

        // Send STARTTLS command if using secured connection
        if ($secured) {
            fwrite($socket, "STARTTLS\r\n");
            $response = fread($socket, 8192);
        }

        // Authenticate with the server
        fwrite($socket, "AUTH LOGIN\r\n");
        $response = fread($socket, 8192);

        // Send base64-encoded email and password
        fwrite($socket, base64_encode($email) . "\r\n");
        $response = fread($socket, 8192);

        fwrite($socket, base64_encode($password) . "\r\n");
        $response = fread($socket, 8192);

        // Check if authentication is successful
        if (strpos($response, '235') !== false) {
            // SMTP connection successful
            fwrite($socket, "QUIT\r\n");
            fclose($socket);
            return true;
        } else {
            // Authentication failed
            fclose($socket);
            return false;
        }
    } else {
        // SMTP connection failed
        return false;
    }
}

// Usage example
$email = 'your-email@example.com';
$password = 'your-password';
$host = 'smtp.example.com';
$port = 587; // Change this to the appropriate SMTP port
$secured = true; // Set to true for secured connection (TLS/SSL)

if (checkSMTPConnection($email, $password, $host, $port, $secured)) {
    echo "SMTP connection successful!";
} else {
    echo "SMTP connection failed!";
}