Binary to Decimal Conversion in PHP

Given a binary number, the task is to convert Binary to Decimal Number in PHP.

Examples:

Input: 1010
Output: 10

Input: 11001
Output: 25

There are different methods to convert Binary to Decimal Numbers, These are:

Using bindec() Function

The bindec() function returns the decimal equivalent of the binary number. It accepts a string argument i.e binary number and returns decimal equivalent.

Syntax:

bindec( $bin_num );

Example:

PHP

<?php

$binNum = 110010;

$decNum = bindec($binNum);

echo "Decimal Number: " . $decNum;

?>

Output

Decimal Number: 50

Using base_convert() Function

The base_convert() function converts a given number in an arbitrary base to a desired base. In this case, we use 2 as fromBase and 10 as desireBase.

Syntax:

string base_convert($inpNumber, $fromBase, $desBase)

Using Conversion AlgorithmExample:

PHP

<?php

$binNum = 110010;

$decNum = base_convert($binNum, 2, 10);

echo "Decimal Number: " . $decNum;

?>

Output

Decimal Number: 50

Using Conversion Algorithm

In this case, we use mathematical conversion algorithm to convert binary to its decimal equivalent. Here, we convert a binary number to decimal by iterating through each bit and summing up the corresponding powers of 2.

PHP

<?php

function binToDec($binNum) {
    $decNum = 0;
    $len = strlen($binNum);

    for ($i = 0; $i < $len; $i++) {
        $decNum += (int)$binNum[$i] * pow(2, $len - $i - 1);
    }

    return $decNum;
}

$binNum = '110010';
$decNum = binToDec($binNum);

echo "Decimal Number: " . $decNum;

?>

Output

Decimal Number: 50