About how to export csv files in php

If you have any questions about how to export csv files in php, do you know why the html source code & nbsp; xls file appears in the file when you download the csv file, based on your poor description, I can only give one bad answer-if your code has a problem, you will be able to see your code at the time of generation, and you will be able to see the csv export in php.
Online, etc. ask if you know why html source code appears in the file when php downloads a csv fileThe xls file is normal.

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Based on your poor description, I can only give one bad answer-your code has a problem.
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Generated
To see your code
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The last table is not closed.
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Header ("Content-Type: text/csv ");
Header ("Content-Type: text/xls ");

How to send two content-type headers