PHP error Cannot modify header information, modifyheader_PHP tutorial

php reported an error Cannot modify header information, modifyheader

The following problem occurred when using CI to develop WeChat public accounts. I looked online and found the solution: Save the error file as utf-8 using editplus.

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at Filename: libraries/Session.php

Line Number: 688

Because every page reports the above error, I guess there is a problem with index.php in the CI root directory. Use the above method to save index.php as utf-8 , problem solved.

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