A simple program to show how to declare do while loop statement in PHP programming.

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Program Listing
    $output = "";
        $number = $_POST["number"];
        $x = 1;
        do {
            $output .= "$x ";
        } while ($x <= $number);

    if ($output != "") {
        $output = '<p class="text-center mb-1">Your numbers are:</p><h3>'.$output.'</h3>';
<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simple Do While Loop In PHP</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
        body {
            background-color: #fafafa;
            min-height: 100vh;
            padding: 50px 0;
        form {
            width: 400px;
<body class="d-flex justify-content-center align-items-center text-center">
    <form action="" method="POST" class="card p-2">
        <div class="card-body">
            <h4>Simple Do While Loop In PHP</h4>
            <h5>Jake R. Pomperada, MAED-IT, MIT</h5>
            <div class="my-4">
                <label for="number" class="form-label">Enter a number:</label>
                <input type="number" class="form-control" name="number" id="number">
                <button type="submit" class="btn btn-primary btn-sm btn-block w-100 mt-2">OK</button>
            <?php echo $output; ?>