Detailed example of php code to implement 7-line pyramid

7 Line Pyramid is a fun math and programming problem that requires us to print a pyramid shape of numbers and spaces on the screen. This kind of problem can be solved through various programming languages. This article will introduce how to use PHP code to implement a 7-line pyramid.

1. Understanding the problem

First of all, we need to understand the problem. The pyramid is composed of numbers and spaces, with the number of numbers increasing and the number of spaces decreasing at each level. As shown below is an example of a 7-line pyramid:

      1
     232
    34543
   4567654
  567898765
 67890109876
7890123210987

We need to use PHP code to print out this pyramid shape.

2. Solve the problem

To solve this problem, we need a loop structure to control the output of each line. We can achieve this using a for loop statement. According to the rules in the picture above, we need to print numbers and spaces in each line. Therefore, we can accomplish this task through nested for loops.

The following is the program implementation code:

$num = 1; //记录数字
for($i = 7; $i >= 1; $i--) { //外层循环控制行数
    for($j = 1; $j < $i; $j++) { //内层循环控制空格的数量
        echo " ";
    }
    for($k = 1; $k <= $num; $k++) { //内层循环控制数字的数量
        echo $k % 10;
    }
    for($l = $num - 1; $l >= 1; $l--) {
        echo $l % 10;
    }
    echo "\n"; //换行
    $num++; //数字数量递增
}

In the above code, we use two nested for loops to control the output of spaces and numbers. The outer loop controls the number of lines, and the inner loop controls the output of spaces and numbers respectively. At the same time, we used the $num variable to record the number of numbers. The number of numbers in each row is the number of numbers in the previous row plus 1. After each line of output, we need to increment the $num variable.

3. Running results

When we run the above code, we will get the following output:

      1
     232
    34543
   4567654
  567898765
 67890109876
7890123210987

We can see that we have Successfully implemented a 7 row pyramid using PHP code.

4. Summary

In this article, we introduced how to implement a 7-row pyramid using PHP code. We first understood the problem and then constructed a program using a for loop to solve the problem. After running the program, we successfully got a pyramid-shaped output.

For programming problems, it is crucial to understand and master basic grammar and logical thinking. In the process of actually solving problems, we can improve our programming level through continuous practice and learning.

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