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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr = [
'a' => 1,
'а' => 2,
'b' => 3,
'б' => 4,
'c' => 5,
'в' => 6,
];
ksort($arr, SORT_LOCALE_STRING);
print_r($arr);
krsort($arr, SORT_LOCALE_STRING);
print_r($arr);