Save new food

Name:
Book:
Price:
Search by Author name

Informatsioon

Name	Price	Book
John Obrey	12.05$	Brief Lives
Arthur Doyle	5.03$	The parasite
Agatha Christie	17.2$	The last Seance
William Somerset	19.4$	Rain
John Taylor	18.7$	Lucky Dip
Lewis Carroll	10.2$	Haddocks Eyes
eee	w$	eee
asd	asdad$	asdsa
	$
	$
	$
	$	b
	$	brief
john	$
.	$
Link XML fail
<?php
if(isset($_POST['submit'])){
    $xmlDoc = new DOMDocument("1.0","UTF-8");
    $xmlDoc->preserveWhiteSpace = false;
    $xmlDoc->load('xmlbook.xml');
    $xmlDoc->formatOutput = true;

    $xml_root = $xmlDoc->documentElement;
    $xmlDoc->appendChild($xml_root);

    $xml_toode = $xmlDoc->createElement("catalog");
    $xmlDoc->appendChild($xml_toode);

    $xml_root->appendChild($xml_toode);

    unset($_POST['submit']);
    foreach($_POST as $voti=>$vaartus){
        if($voti == "protein" or $voti == "carbs" or $voti == "fats"){

            $kirje = $xmlDoc->createElement($voti,$vaartus);

            continue;
        }
        $kirje = $xmlDoc->createElement($voti,$vaartus);
        $xml_toode->appendChild($kirje);
    }
    $xmlDoc->save('xmlbook.xml');
}
?>
<head>
    <link rel="stylesheet" href="table.css">
</head>

<style>
    header{
        margin-top: 15px;
        color: blue;
        font-family: "Times New Roman Blue";
        font-style: italic;
        margin-bottom: 50px;
        text-align: center;
        font-size: 30px;
    }


</style>
<header>
    <h1>XML andmete salvestamine PHP abil</h1>
</header>
<div id="mainDiv">
    <h2>Save new food</h2>
    <table>
        <form action="" method="post">
            <tr>
                <td><label for="name">Name: </label></td>
                <td><input type="text" name="name" id="name"></td>
            </tr>
            <tr>
                <td><label for="book">Book: </label></td>
                <td><input type="text" name="book" id="book"></td>
            </tr>
            <tr>
                <td><label for="price">Price: </label></td>
                <td><input type="text" name="price" id="price"></td>
            </tr>
            <tr>
                <td><input type="submit" name="submit" id="submit" value="Sisesta"></td>
            </tr>
        </form>
    </table>
    <h2>Search by Author name</h2>
    <form action="?" method="post">
        <input type="text" name="search" placeholder="name..."><br>
        <button type="submit">Search</button>
    </form>
    <h2>Informatsioon</h2>
    <table id="show">
        <tr>
            <th>Name</th>
            <th>Price</th>
            <th>Book</th>


        </tr>
        <?php
        $data = simplexml_load_file('xmlbook.xml');
        foreach ($data->catalog as $catalog){
            if(!empty($_POST["search"])){
                if(strpos(strtolower($catalog->name), strtolower($_POST["search"])) === false)
                    continue;
            }
            echo "<tr>";
            echo "<td>$catalog->name</td>";
            echo "<td>$catalog->price"."$"."</td>";
            echo "<td>$catalog->book".""."</td>";

            echo "</tr>";
        }
        ?>
    </table>
    <a target="_blank" href="xmlbook.xml">Link XML fail</a><br>
    <button onclick="myFunction()">Показать исходный код</button>

    <div style="display: none;" id="myDIV">
        <?php highlight_file("./book.php") ?>
    </div>

    <script>
        function myFunction() {
            var x = document.getElementById("myDIV");
            if (x.style.display === "none") {
                x.style.display = "block";
            } else {
                x.style.display = "none";
            }
        }
    </script>
</div>