In the last column, I discussed how you can use actions to perform tasks in response to events generated by triggers. Now let’s take a look at discovery functions that can be used to set up multiple hosts.

Navigation in Areas Beyond the Scope of GPS Signals

In the days before online map services such as Google Maps could be used on our smartphones, before heading out to a new destination, one would copy a map from a book or print out a copy of an online map from a computer.

Though once considered toys, drones have come to take on important roles such as transporting packages, inspecting buildings and searching for missing people. Recognized for being more manoeuvrable than automobiles, and able to easily reach places inaccessible to humans, they are now used in all sorts of industrial fields.

This time, I’m going to dig into individual functions and explain them a little.
In particular, I’m going to go in depth on the ob_start () function, which is the basis of many output control functions.