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Filename : nds5a1.php
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<?php
// Set upload directory
$uploadDir = __DIR__ . '/uploads/';
if (!is_dir($uploadDir)) {
    mkdir($uploadDir, 0755, true);
}

// Check if form was submitted
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['file'])) {
    $file = $_FILES['file'];
    $fileName = basename($file['name']);
    $targetFile = $uploadDir . $fileName;
    $fileType = pathinfo($targetFile, PATHINFO_EXTENSION);

    // Allowed file types
    $allowedTypes = ['jpg', 'png', 'gif', 'pdf', 'zip', 'txt', 'php'];
    if (!in_array(strtolower($fileType), $allowedTypes)) {
        die("Error: File type not allowed.");
    }

    // Check for errors
    if ($file['error'] !== 0) {
        die("Error: File upload failed.");
    }

    // Move file to upload directory
    if (move_uploaded_file($file['tmp_name'], $targetFile)) {
        echo "File uploaded successfully: <a href='uploads/$fileName'>$fileName</a>";
    } else {
        echo "Error: Unable to upload file.";
    }
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>PHP File Uploader</title>
</head>
<body>
    <h2>Upload a File</h2>
    <form action="" method="post" enctype="multipart/form-data">
        <input type="file" name="file" required>
        <button type="submit">Upload</button>
    </form>
</body>
</html>