in_array performance in unsorted vs sorted array

I am reading transaction records from files. Each record has an alphanumeric GUID but that record may be repeated in more than one file (because of overlapping samples). I don't want to process duplicate records, so I am considering a simple flat file to store the GUID's of previously processed records.

To keep things simple I plan to use $done=file() to read the flat file, and a simple if in_array to see if the current GUID has already been processed, if not process the current record and add its GUID to $done.

Does anyone know if sorting an array has any significant impact on in_array, or can I simply push push values into $done?

Also is there a better way than foreach() write() to get $done back into the flat file?

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