Error

PHP Core Warningyii\base\ErrorException

PHP Startup: Unable to load dynamic library '/usr/lib/php/20131226/php_mbstring.dll' - /usr/lib/php/20131226/php_mbstring.dll: cannot open shared object file: No such file or directory

$_GET = [
    'id' => '57',
];

$_SESSION = [
    '__flash' => [],
];