How can I use $_POST with multipart/form-data for file uploads?

When handling file uploads with $_POST, you need to set the form’s enctype attribute to multipart/form-data. This allows the browser to send file data in a format that can be processed by PHP:

<form method="post" action="upload.php" enctype="multipart/form-data">
    <label for="file">Choose file:</label>
    <input type="file" id="file" name="file">
    <input type="submit" value="Upload">
</form>

In upload.php, process the uploaded file with the $_FILES array. This array contains file details like $_FILES["file"]["tmp_name"] for the temporary file path and $_FILES["file"]["name"] for the original file name.