PSR Compliant Basic Auth Decode

http-basic-auth.php

<?php

/**
 * Get the HTTP Basic Auth information from the request.
 *
 * @param ServerRequestInterface $request
 *
 * @return array
 */
function getBasicAuth(ServerRequestInterface $request): array
{
    $header = $request->getHeader('authorization');
    $header = reset($header);
  
    preg_match("/^Basic (.*)$/", $header, $matches);
  
    if (count($matches) <= 1) {
        return [
          'username' => null,
          'password' => null
        ];
    }
  
    $token = $matches[1];
    $token = base64_decode($token);
  
    [ $username,
      $password ] = explode(':', $token);
  
    return compact('username', 'password');
}