<?php
// The normal way
echo sha1('1981');
echo PHP_EOL;
// Your way
$str = mb_convert_encoding('1981', 'UTF-16LE');
echo $result = strtoupper(sha1($str));
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
ea1b37da89c9714afa6e8264911e12813c480b40
128C108C5FAEF01FE0774DB296D99F721F27BC33