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[PHP] 可読性0の短めなbase64エンコード・デコード関数 (v2)

Last updated at Posted at 2024-09-07

この記事は、以下の記事に書いたやつがさすがにゴミだったので、その改訂版です

b64fn.php
    $b64Arr = array_merge(range("A", "Z"), range("a", "z"), range("0", "9"), ["+", "/"]);

    function b64safe(string $b64, bool $dec = false, array $rep = [["+", "/", "="], [".", "_", "-"]]):string {
        return str_replace($rep[(int) $dec], $rep[(int) !$dec], $b64);
    }

    function blockPad(string $str, string $pad, int $len, bool|int $right = false) {
        $i = 0;
        while ($i < strlen($str)) $i += $len;
        return str_pad($str, $i, $pad, (int) $right);
    }

    function bin2b64(string $bin):string {
        return blockPad(implode("", array_map(fn($v) => $GLOBALS["b64Arr"][bindec($v)], str_split(blockPad($bin, "0", 6), 6))), "=", 4, true);
    }

    function b642bin(string $b64):string {
        return implode("", array_map(fn($v) => str_pad(decbin(array_search($v, $GLOBALS["b64Arr"], true)), 6, "0", 0), str_split(str_replace("=", "", $b64))));
    }

    function b642intArr(string $b64, int $spl = 5):array {
        return array_map(fn($el) => intval(b642bin($el), 2), str_split(blockPad($b64, "A", $spl), $spl));
    }
関数 引数 引数の説明 返り値
b64safe() $b64 入力するbase64 $repのルールによって
エンコード/デコードされたbase64
$dec false エンコード
true デコード
$rep 変換ルールの指定
blockPad() $str 入力する文字列 $lenの倍数の長さになるように
paddingされた文字列
$pad padに使用する文字
$len pad後の文字列の倍長
$right paddingする方向
bin2b64() $bin 入力するbinary_string $binからbase64へ変換した文字列
bin2b64() $b64 入力するbase64 $b64からbinaryへ変換した文字列
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