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Chapter 11, pg. 301, contains the following text: If you are running PHP 5.1 or greater, you can add the LOCK_EX constant as the third argument to file_put_contents(): file_put_contents($file, $data, LOCK_EX); To use both the LOCK_EX and FILE_APPEND constants, separate them with the binary OR operator (|): file_put_contents($file, $data, FILE_APPEND | LOCK_EX); It doesn’t matter in which order you list the two constants. This is a really interesting solution, and I'm surprised my mind didn't registered it when I was reading that book for the first time. Could s