When it comes to file uploading, it's important to make sure that everything is in order. During the PHP file upload, it will avoid unexpected answers from the server.
Before moving the file to the target directory, this function verifies the following four requirements. It confirms,
- If the file isn't already empty.
- If the file doesn't already exist in the target, it will be created.
- If the file type is one of the allowed extensions.
- If the file size does not exceed the limit.