How to fix the "headers already sent" error: omit the closing tag in pure PHP scripts

Full PHP course: ➤ https://davehollingworth.net/phpy 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.basic-syntax.phptags.php https://www.php-fig.org/psr/psr-2/ http://php.net/manual/en/outcontrol.configuration.php#ini.output-buffering