We can implement a binary tree using a PHP array. Since a binary tree has a maximum of zero to two child nodes, we can use the maximum child nodes as 2 and construct a formula to find the child nodes of a given node. Let's number the nodes in a binary tree from top to bottom and left to right. So, the root node will have number 0, the left child 1, and right child 2, and this will follow until each node is numbered, just like the following diagram:
We can easily see that for node 0, the left child is 1, and the right child 2. For node 1, the left child is 3, and the right child is 4, and it goes on. We can easily put this in a formula:
If i is our node number, then:
Left node = 2 X i + 1
Right node = 2 X (i + 1)
Let's now create our example for the match schedule part using a PHP array. If we rank it as per our discussion, then...