php - How to remove last two characters every line of text file -

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How to remove the last two letters of each line of the text file? for example. A.T.T. In the new txt file: 

  100815 100815 100822 100822 200811

Thank you :) 

  $ Content = file ("long.txt"); $ Fp = fopen ('short.txt', 'w'); Forex currency ($ $ $ content in line) {$ small = substrate (trim ($ line), 0, -2); FILIT ($ FP, $ small. "\ N"); } Fclose ($ fp);

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