functions.php

<?php
// koneksi
$conn = mysqli_connect("localhost","root","","blog");

function query($query){
  global $conn;
  $result = mysqli_query($conn, $query);

  $rows   = [];

  while ( $row = mysqli_fetch_assoc($result) ) {
    $rows[] = $row;
  }

  return $rows;
}

 ?>