What role does the enctype attribute play in PHP form submissions for file uploads?

The enctype attribute in PHP form submissions for file uploads specifies how the form data should be encoded before sending it to the server. When uploading files, the enctype attribute should be set to "multipart/form-data" to allow the form to handle file uploads properly. Without setting the enctype attribute correctly, the file uploads may not work as expected.

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