sodium_add

    (PHP 7 >= 7.2.0, PHP 8)

    sodium_add — Add large numbers

    Description

    function sodium_add(string &$string1, string $string2): void

    This adds the parameter string2 to string1, overwriting the value stored in string1. This function assumes both parameters are binary strings that represent unsigned integers in little-endian byte order.

    Parameters

    string1
    String representing an arbitrary-length unsigned integer in little-endian byte order. This parameter is passed by reference and will hold the sum of the two parameters.
    string2
    String representing an arbitrary-length unsigned integer in little-endian byte order.

    Return Values

    No value is returned.

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    User Contributed Notes 1 note

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    Anonymous
    16 days ago
    <?php

$a = "\x01\x00\x00\x00"; // 1 (32-bit little-endian)
$b = "\x02\x00\x00\x00"; // 2 (32-bit little-endian)

echo "Before: " . bin2hex($a) . PHP_EOL;

sodium_add($a, $b);

echo "After:  " . bin2hex($a) . PHP_EOL;

?>

Output:

Before: 01000000
After:  03000000
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