A simple program to ask the user to give a number and then it will display if the given number is a prime number or not using PHP programming language.

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Program Listing
    if (isset($_POST["txtNumber"])) {
        $MyNum = $_POST["txtNumber"];
        $n = 0;

        for ($i = 2; $i < $MyNum; $i++) {
            if ($MyNum % $i == 0) {

        if ($n == 0) {
            $output = $MyNum . " is a prime number.";
        } else {
            $output = $MyNum . " is not a prime number.";

<!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>Prime Numbers in PHP</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
<body style="font-family:'Lucida Sans', sans-serif;">
    <main class="container d-flex justify-content-center align-items-center" style="min-height: 100vh;">
        <div class="card p-3">
            <div class="card-body text-center">
                <div class="alert alert-primary mt-2" role="alert">
                    <h2 class="mb-2 text-uppercase">Prime Numbers in PHP</h2>
                    <p class="mb-0">Created By:</p>
                    <h5 class="lh-1">&#187; Jake R. Pomperada, MAED-IT, MIT &#171;</h5>    

                <form class="my-3" action="" method="POST">
                    <div class="mb-1">
                        <label for="txtNumber" class="form-label">Enter a number</label>
                        <input type="text" class="form-control form-control-sm" name="txtNumber" id="txtNumber">
                    <button type="button" class="btn btn-primary btn-sm w-100">Submit</button>
                    if (isset($output)) {
                        echo '<div class="alert alert-primary mt-2" role="alert">