<?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: 03000000sodium_add
(PHP 7 >= 7.2.0, PHP 8)
sodium_add — Add large numbers
Description
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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