commit 60f95f93ac5d886cb6a3a893faca2f32d9d2e7d8
Author: panariga <panariga@gmail.com>
Date:   Tue Jan 7 15:54:23 2025 +0200

    Add baseuaen.php

diff --git a/baseuaen.php b/baseuaen.php
new file mode 100644
index 0000000..15dd8c7
--- /dev/null
+++ b/baseuaen.php
@@ -0,0 +1,56 @@
+<?php
+
+class BaseUAEN
+{
+    private const CHARACTERS = 'ABCEHKMOPTXY'; // Characters valid in both English and Ukrainian
+    private const MIN_LENGTH = 4;
+    private const MAX_LENGTH = 8;
+
+    public function intToCode(int $number, int $length): string
+    {
+        if ($length < self::MIN_LENGTH || $length > self::MAX_LENGTH) {
+            throw new InvalidArgumentException("Length must be between " . self::MIN_LENGTH . " and " . self::MAX_LENGTH);
+        }
+
+        $base = strlen(self::CHARACTERS);
+        $code = '';
+
+        do {
+            $remainder = $number % $base;
+            $code = self::CHARACTERS[$remainder] . $code;
+            $number = intdiv($number, $base);
+        } while ($number > 0);
+
+        return str_pad($code, $length, self::CHARACTERS[0], STR_PAD_LEFT);
+    }
+
+    public function codeToInt(string $code): int
+    {
+        $base = strlen(self::CHARACTERS);
+        $length = strlen($code);
+        $number = 0;
+
+        for ($i = 0; $i < $length; $i++) {
+            $char = $code[$i];
+            $charIndex = strpos(self::CHARACTERS, $char);
+            if ($charIndex === false) {
+                throw new InvalidArgumentException("Invalid character in code");
+            }
+            $number = $number * $base + $charIndex;
+        }
+
+        return $number;
+    }
+
+    public function generateRandomInt(int $length): int
+    {
+        if ($length < self::MIN_LENGTH || $length > self::MAX_LENGTH) {
+            throw new InvalidArgumentException("Length must be between " . self::MIN_LENGTH . " and " . self::MAX_LENGTH);
+        }
+
+        $base = strlen(self::CHARACTERS);
+        $maxNumber = bcpow($base, $length) - 1;
+
+        return random_int(0, $maxNumber);
+    }
+}
\ No newline at end of file