The idea is simple. We will use binary search to find the square root of the number. If the given number is not a perfect square then we will simply take the floor value of the root of the number.
We know that all objects that are created must be given initial values. We can do this by two approaches. The first approach uses the dot operator to access the instance variables and then assigns value to them individually. But it can be a tedious approach to initialize all the variables of all the objects individually.
array_reverse() is an inbuilt function of PHP used to reverse the array including the nested arrays. It returns the reversed array. But in the case of associative arrays of if you don't want to change the keys of the array, $key_preserve=true can be passed as a parameter to the array_reverse() function.