Method: Initialize the class.
Method: Prepare field.
Method: Arguments passed to sanitization callback.
Method: Format $_FILES field which have multiple files.
Method: Get POST (unsafe) value of a field.
Method: Field markup.
Method: Replace all dummy images found in editor type field.
Method: Callback for preg replace callback for replacing temporary images in a string.
Method: Upload a file.
Method: Save all uploads to server.