Untitled

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Hanif Abyan Ayyasyi XI RPL 2</title>
    <link rel="stylesheet" href="csssk3.css">
</head>
<body>
    <form align="center" action="" method="post">
        <table align = "center">
        <tr>
            <td>Masukan Kalimat : <input type="text" name="kalimat" id="kalimat"></td>
            <td><input type="radio" name="char" id="char" value="a" >a</td>
            <td><input type="radio" name="char" id="char" value="i">i</td>
            <td><input type="radio" name="char" id="char" value="u">u</td>
            <td><input type="radio" name="char" id="char" value="e">e</td>
            <td><input type="radio" name="char" id="char" value="o">o</td>
            <td><input type="submit" value="Kirim" name="submit" autocompalete="off"></td>
        </tr>
        </table>
    </form>

    <?php
        if (isset($_POST['submit'])) {
            $kalimat = $_POST['kalimat'];
            $char = $_POST['char'];
            $jml = strlen($kalimat);
            $a = 0;
            $b = 0;
            while ($a <= $jml) {
                if (substr($kalimat,$a,1) == $char  ) {
                    $b = $b+1;
                }
                $a++;
            }
            echo " <p align='center'>Jumlah huruf $char berjumlah $b </p>";
        }

    ?>
</body>
</html>