I would like to know if it's possible using PhpStorm to change a header signature like this example by another for all files inside directory.
/*
* myfile.php
* @copyright year
* ...
*/
Copyright plugin can surely do that but you will have to define a custom scope for the directory that you need to update. Find more information at https://www.jetbrains.com/help/phpstorm/generating-and-updating-copyright-notice.html and https://blog.jetbrains.com/phpstorm/2016/01/managing-copyright-notices-in-phpstorm/ .