So it’s clearly not uncommon for hugely successful apps to launch on the iPhone, only to show up on Android many moons later. But for apps to make the opposite leap—from Android to iPhone—is exceedingly uncommon. There are two key reasons why that dichotomy exists: money and simplicity. Instagram release illustrates why developers pick iOS over Android | Macworld
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Traits is a mechanism for code reuse in single inheritance languages such as PHP. A Trait is intended to reduce some limitations of single inheritance by enabling a developer to reuse sets of methods freely in several independent classes living in different class hierarchies PHP: Traits - Manual