How to use PHP to output a Yang Hui triangle

Yang Hui's triangle is composed of positive integers, and the numbers are symmetrical. Each row starts from 1 and gradually becomes larger, then becomes smaller, and returns to 1; each number in Yang Hui's triangle is its upper left We can understand it as the sum of the square and the number in the upper right corner as a two-dimensional array, which outputs the data through two loops.

1. What is Yang Hui Triangle?

Yang Hui triangle is a way of writing binomial coefficients. Because the arrangement shape is similar to a triangle, it is called Yang Hui triangle.
Yang Hui’s triangle is composed of positive integers, and the numbers are symmetrical. Each row starts from 1 and gradually becomes larger, then becomes smaller, and returns to 1; each number in Yang Hui’s triangle is the sum of the numbers in its upper left and upper right. We can understand it as a two-dimensional array and output the data through two loops.

2. How to use PHP to achieve it?

We can create a new array to store the array elements output through the loop, customize a function to implement this function, and finally implement it by calling the function.

"; } /通过调用自定义函数来打印10行的杨辉三角 triangle(10); ?>

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