<?php
    function printResult($result_set,$dbh){
        $array = array();
        while(($row = $result_set->fetch_assoc()) != false){
            $array[] = $row;
        }
        echo json_encode($array);
    }
    $user = 'root';
    $pass = '';
    $dbh = new mysqli('127.0.0.1', $user, $pass, 'users');
    $result_set = $result_set = $dbh->query("SELECT * FROM `messages`");
    printResult($result_set, $dbh);
    $dbh -> close();
?>