public function exist(Array $namespaces): string {
    $exist = false;
    foreach ($namespaces as $namespace) {
      if (in_array($namespace, $_SERVER['argv'])) {
        $exist = true;
      }
    }
    return $exist;
  }
public function exist(Array $namespaces): string {
    $exist = false;
    foreach ($namespaces as $namespace) {
      if (in_array($namespace, $_SERVER['argv'])) {
        $exist = true;
      }
    }
    return $exist;
  }
public function exist ( Array $ namespaces ) : string { $ exist = false ; foreach ( $ namespaces as $ namespace ) { if ( in_array ( $ namespace , $ _SERVER [ 'argv' ] ) ) { $ exist = true ; } } return $ exist ; }
- Check variable exist
@param Array $namespaces Variable namespace
@return bool Case exist return true, or false case not exist
- Check variable exist