<?php
  $myPDO = new PDO('sqlite:trying.db');

  //INSERT C
  $sql = "INSERT INTO config (configname, value) VALUES ('Doe', 'john@example.com')";
  $stmt = $myPDO->query($sql);

  //SELECT R
  $sql = "SELECT * FROM config";
  $stmt = $myPDO->query($sql);
  $return = [];
  while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
      array_push($return, $row);
  }
  echo "Select: ";
  print_r($return);

  //UPDATE U
  $sql = "UPDATE config SET value='cambiado' WHERE id=14";
  $stmt = $myPDO->query($sql);

  //DELETE D
  $sql = "DELETE FROM config WHERE id=13";
  $stmt = $myPDO->query($sql);
?>