How can the warning "The second argument to copy() function cannot be a directory" be addressed in PHP file upload code?

When uploading a file using the copy() function in PHP, the second argument should be a file path, not a directory path. To address the warning "The second argument to copy() function cannot be a directory", you need to ensure that the second argument provided is a valid file path where the uploaded file will be copied. 

// Check if the uploaded file is valid
if ($_FILES['file']['error'] === UPLOAD_ERR_OK) {
    $uploadDir = 'uploads/';
    $uploadFile = $uploadDir . basename($_FILES['file']['name']);
    
    // Check if the second argument is a file path, not a directory
    if (is_dir($uploadFile)) {
        echo "Error: The second argument cannot be a directory.";
    } else {
        // Copy the uploaded file to the specified directory
        if (move_uploaded_file($_FILES['file']['tmp_name'], $uploadFile)) {
            echo "File uploaded successfully.";
        } else {
            echo "Error uploading file.";
        }
    }
} else {
    echo "Error uploading file.";
}

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