How can PHP be used to display whether a user is currently uploading files?

To display whether a user is currently uploading files in PHP, you can use the $_FILES superglobal array to check if any files are being uploaded. If files are being uploaded, you can display a message to the user indicating that the upload is in progress. 

<?php
if(isset($_FILES) && !empty($_FILES)){
    echo "Files are currently being uploaded.";
} else {
    echo "No files are being uploaded.";
}
?>

Keywords

PHP file upload $_FILES is_uploaded_file() file upload progress

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