Push Pull

SELECT `name` FROM `user` WHERE `id` IN (1,2,3,4,5);
что альтернативно запросу
SELECT `name` FROM `user` WHERE `id` = 1 OR `id` = 2 OR `id` = 3 ....

function isset(r) {
    return typeof r !== 'undefined';
}
// проверка на переменную varname в глобальном контексте
console.log(isset(window['varname']);
// проверка на переменную V у объекта
console.log(isset(App.V));

$ids = array('B','C','D'); // ваш  $jsondecoded массив
$marks = implode(',', array_fill(0, count($ids), '?'));
$stmt = $pdo->prepare("SELECT * FROM news WHERE id IN ($marks)");
foreach ($ids as $k => $id) {
    $stmt->bindValue(($k+1), $id);
}
$stmt->execute();

function getHTMLOfSelection () {
      var range;
      if (document.selection && document.selection.createRange) {
        range = document.selection.createRange();
        return range.htmlText;
      }
      else if (window.getSelection) {
        var selection = window.getSelection();
        if (selection.rangeCount > 0) {
          range = selection.getRangeAt(0);
          var clonedSelection = range.cloneContents();
          var div = document.createElement('div');
          div.appendChild(clonedSelection);
          return div.innerHTML;
        }
        else {
          return '';
        }
      }
      else {
        return '';
      }
    }

class User {
    public $username;
    public $login;
}