PHP Warning: Header Already Sent

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Help, I am getting a php warning error similar to the below:

PHP Warning: Cannot modify header information - headers already sent in /home/user/public_html/filepath/filename.php

This happens when there is some sort of whitespace in the file. Check the mentioned php filename (in error message) for whitespace before the lines and remove
the whitespace, usually a blank line.

Typically, this will happen in a configuration file.