Bin to Dec PHP

Introduction

In programming, it is often necessary to convert binary (base-2) numbers to decimal (base-10) numbers. This can be achieved using various algorithms and programming techniques. In this guide, we will explore different methods to convert binary numbers to decimal in PHP.

Algorithm 1: Using built-in functions

// Binary to decimal conversion using built-in functions
$binaryNumber = "101010"; // example binary number

$decimalNumber = bindec($binaryNumber);

echo "Binary number: $binaryNumber\n";
echo "Decimal number: $decimalNumber\n";

In this method, we utilize the bindec() function provided by PHP. It converts a binary string to its decimal equivalent.

Algorithm 2: Manually converting binary to decimal

// Binary to decimal conversion without using built-in functions
$binaryNumber = "101010"; // example binary number

$decimalNumber = 0;
$power = 0;

// Reverse the binary number for easier processing
$reversedBinaryNumber = strrev($binaryNumber);

// Loop through each digit of the reversed binary number
for ($i = 0; $i < strlen($reversedBinaryNumber); $i++) {
    $digit = intval($reversedBinaryNumber[$i]);

    // Only consider valid binary digits (0 or 1)
    if ($digit === 0 || $digit === 1) {
        $decimalNumber += $digit * pow(2, $power);
        $power++;
    } else {
        echo "Invalid binary number!\n";
        break;
    }
}

echo "Binary number: $binaryNumber\n";
echo "Decimal number: $decimalNumber\n";

This method demonstrates manual conversion of a binary number to decimal without using any built-in functions. It involves reversing the binary number and iterating through each digit, multiplying it by the corresponding power of 2, and summing the results.

Algorithm 3: Recursive binary to decimal conversion

// Recursive binary to decimal conversion
function binaryToDecimal($binaryNumber) {
    // Base case: empty binary number
    if ($binaryNumber === "") {
        return 0;
    }

    $lastDigit = intval(substr($binaryNumber, -1));
    $remainingBinary = substr($binaryNumber, 0, -1);

    return binaryToDecimal($remainingBinary) * 2 + $lastDigit;
}

$binaryNumber = "101010"; // example binary number

$decimalNumber = binaryToDecimal($binaryNumber);

echo "Binary number: $binaryNumber\n";
echo "Decimal number: $decimalNumber\n";

This algorithm demonstrates a recursive approach to convert a binary number to decimal. It recursively calculates the decimal value by continuously dividing the binary number and adding the remainder to the result.

These are three different methods to convert a binary number to decimal in PHP. Choose the method that suits your needs and coding style.