File Put Contents New Line

file_put_contents('hfchat.txt', file_get_contents('wget.txt'), FILE_APPEND | LOCK_EX);

This is my current code. I need to know how to put a line break, because currently it appends to the last line of hfchat.txt rather than going to the next line and appending.

file_put_contents('hfchat.txt',PHP_EOL, file_get_contents('wget.txt'), FILE_APPEND | LOCK_EX);

does not work