Omit closing tag at end of include file
If you omit the closing tag of an include file, you will prevent the parser from adding extra output which could cause problems because of the way it outputs headers separate from the data. Sometimes it will add an extra line if it sees ?> at the end of a file. Some text editors actually add an extra line to the end of your file when you save it. These things can cause you problems. You could see an error like,
Warning: Cannot modify header information - headers already sent by
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