How to fix the "headers already sent" error: omit the closing tag in pure PHP scripts
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It's best practice to omit the PHP closing tag for files that just contain PHP.
This is because it's too easy to insert whitespace after the closing tag. If you're using a function like header, session_start or setcookie, which send HTTP headers, no whitespace can be sent before the headers. If it is, you get the "headers already sent" error.
Resources shown in the video:
http://php.net/manual/en/language.bas...
https://www.php-fig.org/psr/psr-2/
http://php.net/manual/en/outcontrol.c...
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