PHP Text to Slug Converter

How to Create a Text to Slug Converter in Vanilla PHP

Watch the full tutorial here:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <form action="./backend.php" method="post">
        <input type="text" name="txt">
        <button type="submit">convert text</button>
    </form>
</body>

</html>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $txt = $_POST['txt'];
    $txt = strtolower($txt);
    $txt = str_replace(" ", "-", $txt);
    $txtSlug = preg_replace('/[^a-z0-9\-]/', '', $txt);

    echo "No slug: " . $_POST['txt'];
    echo "<br>";
    echo "Slug: $txtSlug";
}