After updating a php installation on a webserver I noticed the error that is listed below. This indicates that a module tried to be loaded, but it was running successfully. As a result you should have a duplicate entry of loading the module somewhere.
The error will be shown if you type for example php -v
PHP Warning: Module "igbinary" is already loaded in Unknown on line 0
Try to locate which module has a duplicate entry. In my example it was igbinary.
php --ini | grep igbinary
Remove the duplicate load and the warning should be dismissed.