display_price.php

quote.php:
<?php

    require("../includes/config.php");

    render("submit_symbol.php", ["title" => "Submit Symbol"]);

?>

submit_symbol.php:
<form action="get_price.php" method="post">
    <fieldset>
        <legend>Symbol Information</legend>
        <input type="text" name="symbol" placeholder="Enter Symbol Here" value=""/>
        <br/><br/>
        <input type="submit" class="btn btn-default" value="Display Price"/>
    </fieldset>
</form>

get_price.php
<?php

    require("../includes/config.php");

    $stock = lookup($_POST["symbol"]);

    if ($stock === false)
    {
        apologize("That's an invalid symbol!");
    }

    render("display.php", ["stock" => $stock, "title" => "Stock Price"]);

?>

display.php:
<div>
    <p>A share of <?= $stock["name"] ?> (<?= $stock["symbol"] ?>) is worth $<?= number_format($stock["price"], 2) ?>.</p>
</div>