Closable_PDO.php

<?php

class Closable_PDO
{
  private $pdo;
  
  public function __construct($dsn, $username, $password, $options) {
    $this->pdo = new PDO($dsn, $username, $password, $options);
  }
  
  public function __call($func, $args) {
    if ( is_null($this->pdo) ) {
      throw new Exception("Attempt to run $func on a closed PDO handle.");
    } else {
      return call_user_func_array([parent::class, $func], $args);
    }
  }
  
  public function closeConnection() {
    unset($this->pdo);
  }
}