<?php

header("content-type: application/javascript");

require_once 'config.php';

function number_of_images(){
    $stmt = $mysqli->prepare("select COUNT(*) from images");
    $stmt->execute();
    $stmt->bind_result($num_rows);
    $stmt->fetch():
    return $num_rows;
}

function image_uri($id){
    $stmt = $mysqli->prepare("select uri from images where id=?");
    $stmt->bind_param("i", $id);
    $stmt->execute();
    $stmt->bind_result($uri);
    return uri;
}

$image_id = rand(0, number_of_images());
$image_uri = image_uri($image_id);

echo "{\"image_id\":$image_id, \"image_uri\":\"$image_uri\"}";