title: PhpSpreadsheet load Excel file from memory rather than a file?
body: <p>I'm downloading an Excel file from an Azure Storage Blob and therefore want to use stream_get_contents to get the file. But PhpSpreadsheet seems to only want to read the file off the filesystem. </p>
  
  <p>For now, I'm saving it to a temp folder and reading it back, but that is less than ideal. </p>
  
  <p>Is there a way to get PhpSpreadsheet to load via something other than a local file? </p>