WordPress Plugin Development Noticeable Error

When I was developing a free plugin to be submitted to WordPress.org repository, I encounter a weird line says
The plugin generated `n` characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

I troubleshoot it by doing trial and error until I found and deleted this last line of php file

?>

Basically PHP code should look like this

<?php /* your code here */ 
?>

You can omit the 3rd line and it should work.

This seems to be the culprit, based on my experience, this shouldn’t be worried enough and it’s just a minor WordPress problem, you can contact the plugin author for this error in order to help them developing their plugin flawlessly.

WordPress Plugin Development Noticeable Error1.00/5 (20.00%) 1 vote
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Elvin is one of the contributors of InnoveDesigns.com. He has been creating Wordpress Plugins, Magento Extensions, & Mobile Applications. If you find this article useful, please Follow him on .

Published under Web Development Guide, Wordpress