A program that will ask the user to give a decimal number and then it will convert into octal equivalent using PHP programming language.

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Program Listing

index.htm

<?php
    $output = "";
    if (isset($_POST["txtNumber"])) {
        $output = '<div class="output">Octal Value = '.
                        decoct($_POST["txtNumber"]).
                  '</div>';
    }
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <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>Decimal To Octal In PHP</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            background-color: #eee;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: sans-serif;
        }
        form {
            background: #fff;
            padding: 30px;
            border-radius: 10px;
        }
        h2 {
            margin-bottom: 20px;
        }
        label,
        input,
        button {
            display: block;
            width: 100%;
            font-size: 14px;
        }
        label {
            padding: 5px 0;
        }
        input {
            padding: 5px;
            margin-bottom: 5px;
        }
        button {
            padding: 8px 0;
            background-color: #03a9f4;
            border: none;
            border-radius: 3px;
            color: #fefefe;
            cursor: pointer;
        }
        .output {
            margin-top: 10px;
            background-color: #607d8b;
            padding: 12px 0;
            color: #fefefe;
            text-align: center;
        }
    </style>
</head>
<body>
    <form action="" method="post">
        <h1>Decimal To Octal In PHP</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <label for="txtNumber">Enter a number to convert:</label>
        <input type="number" name="txtNumber" id="txtNumber" value="<?= isset($_POST["txtNumber"])?$_POST["txtNumber"]:""; ?>" autofocus>
        <button type="submit">Convert To Octal</button>
        <?= $output; ?>
    </form>
</body>
</html>

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