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Consider following code: <?php namespace Acme\Something; use Doctrine\Common\EventSubscriber; // This is an interface and in include path class MySubscriber extends EventSubscriber { } ?> As PHP class can't extend from an interface, NetBeans could add a warning or error that class MySybscriber tries to extend an interface (and possibly hint to use "implements" instead of "extends").
A good idea, IMHO. Thanks for reporting.