Learn PHP programming: while loop to implement solid diamond pattern

Learning PHP programming: while loop implements solid diamond pattern

In the process of learning PHP programming, the loop structure is a very important part, and the while loop is the most basic and One of the most commonly used loop structures. Through the nesting and logic control of while loops, we can implement various patterns. Today we will learn how to write code in PHP to implement a solid diamond pattern.

First of all, we need to clarify the basic characteristics of the solid diamond pattern: the diamond is composed of a series of spaces and asterisks, and the number of asterisks in each row increases and then decreases. To realize this pattern, we can follow the following steps to write PHP code:

Step 1: Determine the number of rows of the rhombus
First, we need to determine the number of rows of the rhombus, assuming we choose 7 rows to draw rhombus, then the center row of the rhombus is row 4.

Step 2: Write PHP code
Now, let us write PHP code, first define the number of rows of the diamond, and then use while loop nesting to achieve the output of the diamond pattern.

<?php
$rows = 7; // Number of rows in the diamond

// The upper part of the rhombus
$row = 1;
while($row <= $rows){
    $spaces = $rows - $row;
    while($spaces > 0){
        echo " ";
        $spaces--;
    }

    $stars = 2 * $row - 1;
    while($stars > 0){
        echo "*";
        $stars--;
    }

    echo "<br/>";
    $row ;
}

// Lower half of the rhombus
$row = $rows - 1;
while($row > 0){
    $spaces = $rows - $row;
    while($spaces > 0){
        echo " ";
        $spaces--;
    }

    $stars = 2 * $row - 1;
    while($stars > 0){
        echo "*";
        $stars--;
    }

    echo "<br/>";
    $row--;
}
?>

In this code, we first define the number of rows of the diamond as 7, and then use two while loops, one to control the output of spaces and the other to control the asterisks. output. In this way, the output of a solid diamond pattern can be achieved.

Through this simple example, we can have a deeper understanding of the use of while loops, and at the same time exercise our ability to write PHP code. I hope you can practice more in the process of learning PHP programming and continuously improve your programming skills!

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