In the world of physical mail, there is a struggle to address letters and envelopes individually. In the world of email, it gets easier because you can send one letter to multiple address. But what do you do in the software world, when you need one application to communicate with multiple external processes, systems and other applications?
Currently, we live in a period in which the majority of users use different types of devices to connect to the internet. The most popular devices are smartphones, tablets and notebooks. Developing systems for different types of devices requires the work of building web services, also known by the name of API (Application Program Interface).
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Object oriented programming came late to PHP. It has been around in other languages like C++, Ruby, Python and JavaScript for much longer, but its demand in PHP is becoming stronger. With that demand for the programming style there is an increasing demand for developers who can program in object oriented PHP. And those programmers typically earn considerably more than their fellow web developers whose background is only limited to procedural PHP.
