The error "Undefined index: (name of the file input)" in PHP usually occurs when the form that is used to upload the file is not properly configured.
You can use the following HTML code to create a form that allows users to select and upload multiple files.
Here, we will assist you in finding the best way to increase the file upload size with the help of PHP arsenal. Read it carefully and follow the examples.
To upload a file using cURL in PHP, you can use the curl_setopt function to specify the CURLOPT_POSTFIELDS option with the file data.
The error message typically occurs when the PHP script is trying to move an uploaded file from its temporary location to a new destination.
To upload a DOC or PDF file using PHP, you will need to use the move_uploaded_file function.