PHP Programming Guide: Using while loop to draw a solid diamond

PHP Programming Guide: Using while loops to draw solid diamonds

In PHP programming, using loops is almost one of the essential operations. This article will introduce how to use a while loop to draw a solid diamond, giving you a deeper understanding of basic loop operations in PHP and improving your programming skills.

First, let’s take a look at the rhombus style:

 *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *

Next, we will implement the drawing process of this diamond through PHP code. First, we need to determine the number of rows in the diamond, and then print spaces and asterisks according to specific rules.

The following is an example of PHP code for drawing a diamond:

<?php

$rows = 5; // Define the number of rows in the diamond

// The upper part of the rhombus
$spaces = $rows - 1;
$stars = 1;

while ($stars <= $rows) {
    echo str_repeat(' ', $spaces) . str_repeat('*', $stars) . "
";
    $spaces--;
    $stars = 2;
}

// Lower half of the rhombus
$spaces = 1;
$stars = $rows - 2;

while ($stars >= 1) {
    echo str_repeat(' ', $spaces) . str_repeat('*', $stars) . "
";
    $spaces ;
    $stars -= 2;
}

Through the above code, we define a diamond drawing process with a row number of 5. First the upper half of the rhombus, followed by the lower half of the rhombus. Among them, loop and string repetition functions are used to control the printing of spaces and asterisks.

The above code example can be easily run in a PHP environment and outputs the solid diamond shape shown above. You can also modify the number of rows to create diamonds of different sizes according to your needs.

Through this exercise, you can better understand the use of loop structures in PHP, strengthen your understanding of programming logic, and enrich your programming skills. I hope this article can help you better master the basic knowledge of PHP programming and add some fun and challenges to your programming journey.

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