<?php

$server = 'localhost';
$username = '';
$password = '';

$dbname = '';

$dbconn = pg_connect("dbname=$dbname port=5432 host=localhost user=$username password=$password");

$query = pg_query($dbconn, "SELECT id, last_name, first_name, middle_name FROM db_lab_persondata LIMIT $count");
if ($query) {
    while ($row = pg_fetch_assoc($query)) {
        $json[] = array('id' => $row['id'], 'first_name' => $row['first_name'], 'last_name' => $row['last_name'], 'middle_name' => $row['middle_name']);
    }
}

header('Content-type: application/json');
echo json_encode($json);