Hexadecimal to Decimal Conversion in PHP

Given a Hexadecimal Number, and the task is to convert Hexadecimal to a Decimal Number using PHP.

Examples:

Input: hexNum = '1A'
Output: 

Input: hexNum = '634E24'
Output: 6508068

There are three different methods to convert Hexadecimal to Decimal number, these are:

Using hexdec() Function

The hexdec() function converts a hexadecimal number to a decimal number. This function converts numbers that are too large to fit into the integer type, larger values are returned as a float in that case. If hexdec() encounters any non-hexadecimal characters, it ignores them.

Syntax:

hexdec( $value )

Example:

PHP

<?php

function hexToDec($hex) {
    return hexdec($hex);
}

$hexNum = '1A';
$decimalNum = hexToDec($hexNum);

echo "Decimal Value: " . $decimalNum;

?>

Output

Decimal Value: 26

Using base_convert() Function

The base_convert() function converts a given number to the desired base. Both the base should be between 2 and 32 and bases with digits greater than 10 are represented with letters a-z i.e 10 is represented as a, 11 is represented as b and 35 is represented as z.

Syntax:

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

Example:

PHP

<?php

function hexToDec($hex) {
    return base_convert($hex, 16, 10);
}

$hexNum = '634E24';
$decimalNum = hexToDec($hexNum);

echo "Decimal Value: " . $decimalNum;

?>

Output

Decimal Value: 6508068

Using for Loop

In this approach, we perform mathematical operation with for loop to convert the Hexadecimal number to Decimal equivalent.

Example:

PHP

<?php

function hexToDec($hex) {
    $decimal = 0;
    $length = strlen($hex);

    for ($i = 0; $i < $length; $i++) {
        $digit = $hex[$i];
        $decimal = $decimal * 16 + hexdec($digit);
    }

    return $decimal;
}

$hexNum = '1A';
$decimalNum = hexToDec($hexNum);

echo "Decimal Value: " . $decimalNum;

?>

Output

Decimal Value: 26