PHP Program to find Number Combination

Posted in PHP Tutorial

Updated on Jan 11, 2024

By Mari Selvan

👁️ 84 - Views

⏳ 4 mins

💬 1 Comment

Photo Credit to CodeToFun

🙋 Introduction

In the realm of programming, creating combinations of numbers is a common and useful task. A combination is a selection of items from a collection, where the order of selection does not matter.

In this tutorial, we'll explore a PHP program that generates combinations of two specified numbers within a given range.

📄 Example

Let's take a look at the PHP code that achieves this functionality.

generateCombinations.php

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<?php
// Function to calculate the number of digits in a number
function countDigits($num)
{
  $count = 0;
  while ($num != 0)
  {
    $num = (int)($num / 10);
    ++$count;
  }
  return $count;
}

// Function to generate combinations of two numbers up to a specified limit
function generateCombinations($number1, $number2, $limit)
{
  echo "List of combinations of $number1 and $number2 up to $limit:\n";

  for ($i = 1;$i <= $limit;++$i)
  {
    $currentNumber = $i;

    // Check if the current number contains only the specified digits
    while ($currentNumber > 0)
    {
      $digit = $currentNumber % 10;
      if ($digit != $number1 && $digit != $number2)
      {
        break;
      }
      $currentNumber = (int)($currentNumber / 10);
    }

    // If the current number contains only the specified digits, print it
    if ($currentNumber == 0)
    {
      echo "$i ";
    }
  }

  echo "\n";
}

// Driver program
// Replace these values with your desired numbers and limit
$targetNumber1 = 4;
$targetNumber2 = 8;
$combinationLimit = 500;

// Call the function to generate combinations
generateCombinations($targetNumber1, $targetNumber2, $combinationLimit);

?>

💻 Testing the Program

To test the program with different values, replace the values of $targetNumber1, $targetNumber2, and $combinationLimit in the code.

Output

List of combinations of 4 and 8 up to 500:
4 8 44 48 84 88 444 448 484 488

Run the script to see the list of combinations.

🧠 How the Program Works

The program defines a function countDigits to calculate the number of digits in a given number.
The function generateCombinations generates combinations of two specified numbers up to a given limit.
Inside the function, it iterates through numbers from 1 to the specified limit.
For each iteration, it checks if the current number contains only the specified digits.
If the condition is met, the current number is a combination, and it is printed.

🧐 Understanding the Concept of Number Combination

Before delving into the code, let's take a moment to understand the concept of combinations. In mathematics, a combination is a selection of items from a collection, where the order of selection does not matter.

For example, consider the specified numbers as 4 and 8. The combinations of 4 and 8 up to 500 include 4, 8, 44, 48, 84, 88, 444, 448, 484, and 488.