Php parameter passing

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here is the working example. note that this REALLY needs to be included in a PHP cookbook recipe. note its really pretty simple, but i have not worked with PHP enough recently to have figured this out quickly:

<?php

// written by ashu4code

$parmArray =    [       'Parm1'         =>      'One'
                ,       'Parm2'        =>      'Two'
                ,       'ServerTime'    =>       date('Y-m-d H:i:s')
                ];


$state = !empty($_GET["state"]) ? $_GET["state"] : null;
                          // ?? required?? $code = !empty($_GET["code"]) ? $_GET["code"] : null;

require 'vendor/autoload.php';
use Auth0\SDK\Auth0;

define('redirectUrl'         ,       ( $_SERVER['HTTPS'] ? 'https' : 'http' )
                                        .       '://'
                                        .       $_SERVER['HTTP_HOST']
                                        .       $_SERVER['SCRIPT_NAME']
                                );

$auth0 = new Auth0([
  'domain' => 'dev-2a5XXX8.auth0.com',
  'client_id' => 'kZvXXXXXXXC',
  'client_secret' => '4pXXXXW0',
  'redirect_uri' => constant('redirectUrl'),
  'scope' => 'openid profile email',
]);

$userInfo = null;
try {
        $userInfo = $auth0->getUser();
} catch (Exception $e) {
        $auth0->logout();
        error_log( 'Line: ' . __LINE__ . ' -- Caught Auth0 exception: ' .  $e->getMessage() . ' -- exiting program.' . "\n" );
        header('Location: ?logout=1' ) ;
        exit;
}

if (!$userInfo) {
    // We have no user info
    // pass the param in $state variable 
        $state = http_build_query($parmArray);
        $auth0->login($state, null, []);
        exit;
} else {
    // User is authenticated
        $userInfo = $auth0->getUser();
        printf( 'Hello %s!', htmlspecialchars( $userInfo['name'] ) ); 

                // display the parameters
        $get_string = $state;
        echo '<br />Result:<br />';
        parse_str($get_string, $get_array);
        echo $get_string;
        echo '<br />';
        print_r($get_array);
        echo '<br />';

        phpinfo();  // or just look here for the parameters
   
}