Undefined index: txtnum in C: xampp htdocs factor.php on line 2, can anyone help with this error?

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follows the codes:

<html>
<head>
    <title>Fatoração</title>
</head>
<body>
    <form method="post" action="fator.php">
        Numero: <input type="text" name="txtnum"><br>
        <input type="submit" name="Calcular">
    </form>
</body>
</html>

<?php
    $num = $_POST["txtnum"];
    $variavel = $num;
    $fatorial = $variavel;

    while ($variavel > 1) {
        $fatorial = $fatorial*($variavel-1);
        $variavel--;
    }
    echo "Número fatorado: $fatorial";
?>
php xampp

  • I withdrew, continue giving the same error.

  • How to know if the form is sent

  • At first execution $_POST["txtnum"] there is, um isset() in it already solves.

  • try to use isset() on the button Calcular

  • When I give the isset it returns nothing, and testing with the real Empty(empty variable).

No answers

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