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PHP "unknown" error - what does it mean?

Possible duplicate:
How to fix the "Headers Already Submitted" error in PHP

[Mon Jan 10 21:01:26 2011] [error] [client xx.xx.xxx.xx] PHP Warning: it is not possible to change the header information - headers already sent to Unknown on line 0, referer: www.example. com /some.php

Why can't PHP find where the headers came from?

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1 answer

See if you have a space after <? . The header function is quite sensitive and does not work if something is displayed in front of the hand.

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Source: https://habr.com/ru/post/1334995/

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